There is a mathematical side to optical illusions ... in 3D. Another area of Sugihara’s research is “ambiguous objects”, which includes the groundbreaking study of a square-circle visual ...

"I immediately thought it was a trick question and the circles would be the letter O in the text or something like that. But neat illusion!" one person raved on a Reddit thread. Another commented ...

The white circles appear to form a circular ... 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 ...