The geometric equine kind of looks as ... If you’re a really big fan of optical illusions, how about one that you can 3D print? That’s exactly what Struck Duck did with this mindbender.

but Patrick Hughes' mind-boggling 3D art takes the concept to a whole other level. Hughes uses a style he created called "reverspective," painting uncanny optical illusions of a rooms with an ...

There is a mathematical side to optical illusions ... the existence of “impossible objects”: 3D recreations of illustrations representing geometric motion that cannot physically happen.