This is an oldie but a goodie. I periodically use optical illusions in class to stimulate a somewhat different type of discussion. All sorts of nifty common expressions can come into play in the ensuing conversation:
I can barely...
Those lines look straight to me.
What? Where do you see the dog? I can't make anything out.
I'm not seeing what everyone else is seeing.
I could have sworn that...
This square looks darker than that square.
Are those lines straight or curved/bent?
The dots keep appearing and disappearing!
I see Jesus when I blink rapidly. (Heh... I love this one.)
It's a skull-- no, wait! It's a woman in front of a mirror!
But when you turn it upside down...
(and so on)
_
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