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I am the most non constructive member on the forum maybe and "Off Topic" is my favorite place to post.... So I came up with another off topic post....
post the photos or links of optical illusions you like...
e.g:
Answer this simple question. Is the circle:
1. Half way up the pyramid?
2. Above half way up the pyramid?
3. Below half way up the pyramid?
At this point many viewing this optical illusion pause. They know it wouldn't be an optical illusion if it wasn't different then it seems.
I am giving the solution too but you need not do the same.... let people use their heads for a while...
At first glance (even second and third glance) the circle appears above the point that is half way up the pyramid. The truth is though the circle is exactly at the half way point.
Feel free to pull the ruler out and measure for yourself.
