Reposted from the Kahlert School of Computing.
Fifty years after a small digital teapot made its first appearance at a graphics conference, the object returned to the SIGGRAPH stage with the researchers who helped make it an icon.
On July 23, computer graphics pioneers Martin Newell and Jim Blinn joined Cem Yuksel, professor in the University of Utah's Kahlert School of Computing, at SIGGRAPH 2026 in Los Angeles for "The Return of the Utah Teapot." Their talk traced the model from a sketch on engineering paper to a standard test object used across research, software, films, games and digital art. It also presented Version 2026, a newly refined Utah Teapot designed by Yuksel for today's graphics work.
A practical model becomes an icon
The Utah Teapot began in 1975, when Martin Newell was a doctoral student at the U, then home to an emerging hotbed of computer graphics research founded by David Evans and Ivan Sutherland. Newell wanted curved, procedural models that could be represented efficiently and converted into as many polygons as a rendering required.
The choice of subject came during tea with his wife Sandra. As Newell recalled during the anniversary talk, she pointed to the tea service in front of them and suggested, "Why don't you model these?" He sketched the teapot's profile and Bézier patch layout on engineering paper, then entered the coordinates by hand. The resulting model combined smooth curves, a distinctive silhouette, self-occlusion, and surfaces that cast shadows on one another-qualities that made it unusually useful for testing rendering methods.
The original ceramic teapot was a Melitta model purchased at ZCMI in Salt Lake City. It is now held by the Computer History Museum in Mountain View, Calif., where its presence among historic computers reflects the outsize role an ordinary household object came to play in a new technical field.
The teapot that traveled around the world
When Jim Blinn arrived at the University of Utah in 1974, he brought together advances developed by several members of the U's graphics community, including Ed Catmull's rendering work, Bui Tuong Phong's shading model, Jim Kajiya's frame buffer and Newell's teapot.
Blinn used the model to demonstrate texture and reflection in computer-generated images at SIGGRAPH in 1976. He also changed its proportions.
"A thing that I'm most famous for is that I squashed the Teapot," Blinn told the 2026 audience. "I still think it looks better this way!" The comment addresses a long-running myth that the model was shortened to compensate for rectangular pixels. Blinn had already handled pixel shape in his rendering system; rather, he kept the shorter form because he preferred its appearance.
The images Blinn showed at the anniversary talk were not modern reconstructions. They were the original pixel data calculated on a PDP-11 and carried across operating systems and file formats for half a century. The system ran at about 3 megahertz and offered only 64 kilobytes of directly addressable memory for program and data, while a custom frame buffer made a 512-by-480 image visible in real time.
After its 1976 appearance, the teapot spread throughout the graphics community in an era before the web made models easy to share. Researchers reused it to compare algorithms and demonstrate new techniques. It became so familiar that James Arvo and David Kirk jokingly called it the "Teapotahedron," the sixth Platonic solid. Versions later appeared in widely used graphics tools and APIs, as well as in movies, video games, and art.
Six versions and a continuing Utah legacy
The anniversary presentation followed six major versions of the model, each connected to the University of Utah. Newell created the original in 1975. Blinn established its now-familiar proportions in 1976. Frank Crow added a rounded bottom in 1987. Hank Driskill produced the first solid version with an interior in 1992 using the University's Alpha_1 modeling system. Russ Fish refined that interior in 2006.
Yuksel's Version 2026 continues that lineage. He translated the human-readable Alpha_1 definitions into new software that can generate polygonal models in a web browser. His updated teapot improves the interior, adds subtle transitions where the handle and spout meet the body, and adjusts the exterior to make its curvature continuous. That last change prevents visible breaks in reflections across the surface.
The official Utah Teapot page lets visitors examine every historical version, change resolution and geometry options, and download a customized model. The files are freely available for use, with a request that users preserve the model's identity and acknowledge its origin at the U.
A benchmark that still invites experimentation
The teapot endures because it is both technically useful and instantly recognizable. It preserves a direct connection to the early days of computer graphics, when Utah researchers were inventing many of the concepts that underlie modern rendering. At the same time, it remains a practical model for teaching, testing and showing what new graphics methods can do.
Version 2026 now includes an interior, so artists and researchers can remove the lid and place content inside the model-including, Yuksel suggested, simulated tea. Closing the presentation, he invited the community to continue building on the object that has already traveled so far: "Let's go for another 50 years!"
Banner image: Cem Yuksel, Jim Blinn and Martin Newell, left to right, developers of the Utah Teapot. Credit: Kahlert School of Computing.
