Thursday, September 21, 2006

sniff it out

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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