In 1975, Martin Newell had a practical problem. He needed a test object for computer graphics, something with the qualities that make rendering genuinely hard: curves that bend in every direction, surfaces that cast shadows on themselves, and a hole where the spout opens into the body. Rather than invent such a shape, he looked at his own kitchen table and modelled the Melitta teapot sitting on it. The everyday and the exacting met in a single humble form.

What made the teapot spread was as much about generosity as geometry. The dataset was free, it was hard to render well, and it was suddenly everywhere at once, passed from lab to lab as the natural thing to test against. A shape that is difficult and freely shared has a way of becoming universal, and this one did. It remains the most-rendered object in the history of graphics, a teapot that has been drawn by more machines than any other thing.

Even its proportions carry a story. The famous squashed look, the teapot sitting a little lower and wider than the real one, is not Newell's. It belongs to Jim Blinn, who scaled the model to fit an early display and found the squash worked, so it stayed. Generations of software inherited a teapot subtly deformed by the limits of one old screen, and few who used it ever knew why it looked the way it did. The original object, meanwhile, escaped the digital afterlife its likeness enjoys. The real teapot now sits in the Computer History Museum, a small ceramic thing behind glass, quietly outfamed by its own data. The exhibit keeps it as a reminder that the most consequential objects in a field are not always grand. Sometimes they are whatever happened to be on the table when someone needed a curve, a shadow, and a hole to test.