It may not seem interesting at first, but I am intrigued by how they managed to draw the overlapping blades of the IRIS.

> In real camera lenses an adjustable aperture is often constructed from a set of overlapping blades that constitute an iris.

If you naively create 6 blades and rotate them around the pivot (the tiny screw), they will never overlap EACH OTHER. One will end up at the very top, and one at the very bottom.

If you know how this was created, please let me know.