"You could get a non symmetrical 2D image floating in 3D space with the spin method... but that's not what this is." The spinning method *obviously* involves lots of processing since the spinning display is having to describe the outer layer of the object in 3D space for each supported angle of rotation. It's how the projected version works (except the one I saw was in monochrome). Persistence of vision does the rest. The object does not have to be symmetrical.