Brain teasers - based on neuro science

what is the color of two squares?
Which arc comes from the largest circle?
Which horizontal line is longer? - Hold a ruler up to the screen and you will be surprised to discover that the lines are the same length.
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Look at the two inner circles. The one on the right appears bigger than the one on the left, but in actuality they are the same size. Hold up a dime to see for yourself.
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In spite of what your eyes are telling you, the smaller off-center circle is actually perfectly round
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How many legs does this elephant have?
Do the straight horizontal gray lines look curvy to you? Hold up a piece of paper to prove that they are straight and parallel to each other.
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I am so sharp i am like a human buzz saw
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