Klein bottle
(photo)
It does not appear in its "usual" form (but how to use a one-sided bottle?). It is an eight that rotates around an axis while making a turn on itself. If it did not do this, the object would be an immersion of a torus (Article in preparation). The folds are artifacts due to the need to represent the object in an economical way. At higher resolution, this would disappear. There are similar issues with the Boy surface and a similar solution will be provided soon, but those objects will take a bit longer to load, that's all.
Polyhedral Version