Circles are a fun shape to play with. Well, more accurately I was playing with ellipses when I made this, and I got to have fun pretending they were all semitransparent. I think it all came off looking like it was, aside from the orange on the yellow brown mix but I couldn't find a shade that looked better. Anyways, the reason that circles are good is that they are... Actually what I was about to say is expressly untrue. I was gonna say they're a shape that's easy to render in 3D, but you can't actually do that. Still, it's easy to construct things out of those not-spheres.