Orrefors Graal and Ariel Glass: Development, Designers and Technique
The Graal and Ariel techniques are the two most technically significant innovations in the history of Orrefors, and they are among the most important developments in the broader history of twentieth-century glass. Both techniques involve encasing decorated glass within a gather of clear crystal, creating objects in which the decoration is internal rather than surface-applied, visible through the outer layer but separated from it. The visual effects produced by both techniques are unlike those of any other glass process, and the pieces made using them represent some of the most accomplished objects in the Swedish glass tradition. Understanding how these techniques were developed, who developed them, and how they evolved across the twentieth century is essential to understanding Orrefors as a factory and as an artistic institution.
The Origins of Graal: Orrefors in 1916
The Graal technique was developed at Orrefors in 1916 by master glassblower Knut Bergqvist, working in collaboration with the factory's newly appointed artist Simon Gate. The name Graal is derived from the Holy Grail, a choice that reflected the sense within the factory that something genuinely new and significant had been achieved. The technique emerged from a period of intensive experimentation at Orrefors, during which the factory's management had made a deliberate decision to raise the artistic quality of its output by hiring trained artists and investing in technical research.
The context for this decision was the broader transformation of Swedish applied arts in the early twentieth century. The Swedish Society of Crafts and Design, known as Svenska Slöjdföreningen, had been advocating since the late nineteenth century for a closer relationship between industry and artistic design, and the appointment of trained artists to manufacturing firms was part of a wider movement to raise the quality of Swedish industrial production. Orrefors was one of the firms that responded most ambitiously to this movement, and the development of the Graal technique was a direct result of the creative conditions that the factory's investment in artistic talent had created.
The Graal Process: How It Works
The Graal process begins with the creation of a gather of coloured glass, which is blown into a rough form and then allowed to cool completely. This cooled gather, known as the Graal blank, is then worked cold: it can be engraved with a wheel, etched with acid, or sandblasted to create a pattern or image on its surface. The decoration at this stage is applied to the outer surface of the blank, and it can be as detailed and precise as the engraver's skill allows, since the glass is cold and stationary during this process.
Once the decoration of the blank is complete, it is reheated in the furnace until it reaches working temperature. A glassblower then gathers a layer of clear crystal over the decorated blank, encasing it completely. The encased blank is then blown to its final form, with the blowing process stretching and distorting the decoration in ways that are partially predictable and partially determined by the behaviour of the molten glass. The outer layer of clear crystal acts as a lens, refracting the light that passes through it and creating optical effects that enhance the sense of depth and movement in the decoration.
The reheating and blowing stage is the most technically demanding part of the Graal process. The coloured blank and the clear crystal gather must be at compatible temperatures and viscosities for the encasing to succeed, and the blowing must be controlled precisely to achieve the desired final form without distorting the decoration beyond the intended degree. The collaboration between the designer, who determines the decoration of the blank, and the master glassblower, who controls the reheating and blowing, is essential to the success of each piece.
The finished Graal piece has a quality that is quite unlike that of surface-engraved glass. The decoration appears to float within the body of the glass, separated from the outer surface by the layer of clear crystal. The optical distortion created by the encasing layer gives the decoration a sense of depth and movement that changes as the viewing angle changes, and the refraction of light through the coloured glass creates colour effects that are richer and more complex than those achievable through surface decoration alone.
Simon Gate and the First Graal Pieces
Simon Gate was the first artist to work with the Graal technique, and his early Graal pieces established the decorative possibilities of the process. Gate brought to the Graal blank the same figurative sensibility that defined his engraved work, using the cold-working stage to create compositions of figures, animals, and plant forms that were then transformed by the encasing and blowing process. His early Graal pieces from 1916 to the early 1920s are relatively simple in their decoration, reflecting the exploratory character of the technique's early development, but they demonstrate a clear understanding of how the encasing process would affect the decoration and how to design for that effect.
Gate's Graal work is less well known than his large engraved vases, partly because Graal pieces tend to be smaller in scale and partly because the engraved vases were the works that attracted the most attention at the 1925 Paris Exposition. But his Graal pieces are significant both as works in their own right and as the foundation on which subsequent Graal designers built their practice.
Edward Hald and the Development of Graal
Edward Hald, who joined Orrefors in 1917, became the designer most closely associated with the Graal technique across the first half of the twentieth century. Hald's approach to the Graal blank was shaped by his background as a painter and graphic artist, and he brought to the technique a fluency of line and a wit that distinguished his Graal work clearly from Gate's more formal compositions.
Hald's fish subjects were particularly well suited to the Graal technique. The encasing crystal created an effect analogous to looking at fish through water, with the refraction of light through the outer layer enhancing the sense of aquatic depth and movement. His fish Graal pieces, produced across several decades from the 1920s onward, are among the most celebrated works in the Orrefors collection and among the most sought-after pieces in the market for Swedish art glass.
Hald also used the Graal technique for compositions featuring figures, birds, and plant forms, and his range of subjects in Graal was wider than that of any other Orrefors designer. His command of the technique deepened over decades of practice, and his later Graal pieces from the 1950s and 1960s show a confidence and economy that comes from long familiarity with the process. The decoration in his mature Graal work is precisely calibrated to the distortions introduced by the encasing and blowing stages, demonstrating an understanding of the technique that could only be acquired through sustained practice.
Vicke Lindstrand and Graal
Vicke Lindstrand, who joined Orrefors in 1928, also worked with the Graal technique during his time at the factory. His Graal pieces show the same dynamic energy that characterised his engraved work, with compositions that emphasised movement and tension rather than the formal composure of Gate's work or the decorative fluency of Hald's. Lindstrand's Graal figures are elongated and expressive, and his use of the encasing process to enhance the sense of movement in his compositions was technically sophisticated.
His contribution to the Graal tradition at Orrefors was significant but relatively brief, since he left the factory in 1940. The Graal pieces he produced during his twelve years at Orrefors represent an important extension of the technique's expressive range, demonstrating that the process could accommodate an expressionist sensibility as well as the more classical approaches of Gate and Hald.
The Ariel Technique: A New Direction
The Ariel technique was developed at Orrefors in 1937, more than two decades after the Graal technique, and it represented a fundamentally different approach to the problem of internal decoration in glass. Where Graal used engraving or etching to create decoration on the surface of a coloured blank before encasing it, Ariel used sandblasting to create a pattern of recesses in the blank, which then trapped air during the encasing process. The trapped air formed bubbles within the body of the finished piece, arranged in the pattern determined by the sandblasting.
The technique was developed by Vicke Lindstrand and master glassblower Gustaf Bergqvist, working in collaboration with designer Edvin Öhrström. The name Ariel was chosen with reference to the spirit of the air in Shakespeare's The Tempest, a choice that reflected the technique's defining characteristic: the presence of air within the glass body as a decorative element.
The Ariel Process: How It Works
The Ariel process begins, like the Graal process, with the creation of a coloured glass blank. The blank is sandblasted to create a pattern of recesses on its surface: the sandblasting removes glass from the areas it strikes, leaving a textured surface in which the pattern is defined by the depth and distribution of the recesses. The sandblasted blank is then reheated and encased in clear crystal, as in the Graal process.
The critical difference between Ariel and Graal occurs at the encasing stage. When the clear crystal gather is applied to the sandblasted blank, the air trapped in the recesses created by the sandblasting cannot escape. It remains within the glass as bubbles, arranged in the pattern of the sandblasting. The size, shape, and distribution of the bubbles are determined by the depth and character of the sandblasted recesses, and the designer's control over the sandblasting pattern determines the visual character of the finished piece.
The encased blank is then blown to its final form, as in the Graal process. The blowing stretches and distorts the bubble pattern in ways that are partially predictable, and the designer must account for these distortions when creating the sandblasted pattern. The finished Ariel piece contains a three-dimensional pattern of air bubbles within its body, visible through the outer crystal layer and creating effects of internal structure and light that are quite unlike those of any other glass technique.
Ariel pieces can also incorporate coloured glass in addition to the trapped air, with the colour and the bubble pattern working together to create compositions of considerable complexity. The combination of colour and air within the glass body gives Ariel pieces a quality of internal depth that rewards sustained examination, with different elements becoming visible as the viewing angle and light conditions change.
Edvin Öhrström and the Ariel Tradition
Although Vicke Lindstrand was involved in the development of the Ariel technique, it was Edvin Öhrström who became its most celebrated practitioner and who defined the aesthetic possibilities of the process across the following decades. Öhrström joined Orrefors in 1936 and worked at the factory until 1957, and his Ariel pieces from this period are the works that established the technique's international reputation.
Öhrström was trained as a sculptor, and his approach to the Ariel technique was shaped by a sculptor's understanding of three-dimensional form and internal structure. His Ariel compositions used the bubble pattern to create figures and forms that appeared to exist within the body of the glass, suspended in a space defined by the outer crystal layer. His human figures, rendered in trapped air within coloured glass, have a quality of ghostly presence that is unlike anything achievable through surface decoration.
His most celebrated Ariel pieces, produced in the late 1930s and 1940s, depict human figures in compositions that engage with themes of movement, tension, and psychological depth. The figures are not realistic representations but simplified, expressive forms in which the bubble pattern creates a sense of internal structure that gives them a physical presence within the glass. These pieces were shown at major international exhibitions and acquired by leading museums, and they established Ariel as a technique capable of carrying serious artistic content.
Öhrström left Orrefors in 1957 to pursue an independent career as a sculptor, and his departure marked the end of the technique's most intensive period of development. Subsequent Orrefors designers continued to work with Ariel, but the body of work Öhrström produced during his two decades at the factory remains the defining achievement of the technique.
Sven Palmqvist and the Continuation of Both Techniques
Sven Palmqvist, who joined Orrefors in 1928, worked with both the Graal and Ariel techniques during his long career at the factory, alongside his development of the Ravenna and Fuga techniques. His Graal pieces demonstrate the same analytical approach to material that characterised his technical innovations, with compositions that exploited the optical properties of the encasing process in ways that were precisely calculated. His Ariel work, produced alongside Öhrström during the late 1930s and 1940s, contributed to the development of the technique's possibilities during its formative period.
Palmqvist's engagement with both techniques across his career at Orrefors is a reminder that the Graal and Ariel traditions were not the exclusive property of individual designers but were shared resources within the factory, available to all its artists and developed through the collective practice of a community of designers and makers over several decades.
Later Graal and Ariel: The Post-War Period
Both techniques continued to be used at Orrefors after the Second World War, and the post-war period brought new designers to both processes. Eva Englund, who joined Orrefors in 1974, became one of the most significant Graal designers of the later twentieth century. Her Graal pieces used the technique to create compositions of considerable formal sophistication, with a command of the encasing process that reflected decades of accumulated knowledge within the factory.
Ingeborg Lundin, who worked at Orrefors from 1947 to 1971, produced Graal pieces that engaged with the abstract formal language of post-war modernism, using the technique to create compositions in which colour and form were the primary expressive elements rather than figurative imagery. Her work demonstrated that the Graal technique was not limited to the figurative tradition established by Gate and Hald but could accommodate the full range of mid-century modernist approaches.
The Ariel technique was continued by several designers after Öhrström's departure, including Ingeborg Lundin and later designers who brought new approaches to the sandblasting and encasing process. The technique's capacity for internal structural complexity made it particularly well suited to the abstract formal concerns of post-war design, and the Ariel pieces produced in the 1950s and 1960s reflect the broader shift in Scandinavian design toward abstraction and formal experimentation.
Technical Distinctions: Graal and Ariel Compared
The Graal and Ariel techniques share the fundamental principle of encasing decorated glass within clear crystal, but they differ in the nature of the decoration and the visual effects they produce. Graal decoration is created by cold-working the blank before encasing: the engraving or etching produces lines and areas of texture in the coloured glass that are then visible through the outer crystal layer. The decoration in a Graal piece is essentially two-dimensional, applied to the surface of the blank, though the encasing process gives it an apparent depth through optical refraction.
Ariel decoration is created by the pattern of trapped air within the glass body. The bubbles in an Ariel piece are genuinely three-dimensional elements within the glass, not surface decoration viewed through a lens. The visual effect of Ariel is therefore fundamentally different from that of Graal: where Graal creates an impression of depth through optical illusion, Ariel creates actual internal structure through the physical presence of air within the glass.
This distinction has practical implications for collectors. Graal pieces can be identified by the presence of engraved or etched decoration visible within the glass body, typically in a coloured glass layer beneath the outer crystal. Ariel pieces are identified by the presence of bubble patterns within the glass, which may be accompanied by coloured glass but are defined by the air rather than by surface decoration. Both types are typically signed with the technique name as well as the designer's name and the Orrefors factory mark.
Collecting Graal and Ariel Glass
Orrefors Graal and Ariel pieces are among the most actively collected objects in the Swedish art glass market, and significant examples appear regularly at major auction houses and specialist dealers. The market for both techniques is well established, with clear hierarchies of value based on designer, period, size, subject matter, and condition.
For Graal, the most sought-after pieces are those by Edward Hald, particularly his fish compositions from the 1920s through to the 1950s. Large pieces with complex figurative compositions command the highest prices, and pieces with documented exhibition history or museum provenance attract premiums. Simon Gate's Graal pieces are rarer and are collected primarily by specialists in the early Orrefors tradition. Vicke Lindstrand's Graal work from his Orrefors period is also collected, though it is less frequently encountered than his engraved pieces.
For Ariel, the most significant pieces are those by Edvin Öhrström, whose figurative Ariel compositions from the late 1930s and 1940s represent the technique at its most ambitious. These pieces are rare and command substantial prices when they appear at auction. Ariel pieces by other Orrefors designers, including Palmqvist and Lundin, are also collected and represent a more accessible entry point into the Ariel market.
Condition is critical for both techniques. Chips to the rim or foot, scratches to the outer crystal surface, and internal stress marks or cloudiness all affect value significantly. The encasing process in both Graal and Ariel creates pieces with thick walls that are relatively robust, but the outer crystal surface is vulnerable to scratching, and any damage to the surface affects the optical quality of the piece. Pieces should be examined carefully under good light before purchase, and significant acquisitions warrant specialist assessment.
Signatures on Graal and Ariel pieces typically include the designer's name, the Orrefors factory mark, the technique name (Graal or Ariel), and a piece number that can be cross-referenced with the Orrefors factory archive. The archive holds records of a large proportion of the factory's artistic production, and provenance research using the piece number is worthwhile for significant acquisitions. Pieces with clear, complete signatures and documented provenance represent the most secure collecting propositions in both categories.