Since human depth perception relies on calculating the difference between the angle of view coming to each eye, the result is a 3-D optical illusion.

FORBES: Adventures in the Third Dimension

An ardent young heiress named Sophie (Lisa Henni) tells him approvingly, almost worshipfully, that when he looks he truly sees, yet Sophie can't see that the man she's falling in love with is an optical illusion, a pair of eyes reporting to a brain that's unconnected to a heart.

WSJ: Easy Money, Ballplayer: Pelotero, Trishna, Farewell My Queen | A Smart, Dark Thriller From Scandinavia | Reviews by Joe Morgenstern

May stressed the new "effect" was not a hologram, calling it "an optical illusion of sorts".

BBC: Freddie Mercury

The 31-year-old was later cleared by the ICC after a University of Western Australia biomechanical analysis, which concluded that the bent-arm action created an "optical illusion" of throwing.

BBC: Muttiah Muralitharan