Crossword Genius

This isn't what it looks like! (7,8)

Ross

I believe the answer is:

optical illusion

(Other definitions for optical illusion that I've seen before include "outwardly deceptive" , "It's not what it seems!" , "Something deceiving the eye" , "One can't really see it" , "Mirage" .)

I've seen this clue in The New York Times.
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