Look at the moving rectangle, you will perceive its width is changing, but fact is it is constant.
Explanation: the contrast between grey with purple is stronger than the darker grey with purple, and they are alternative changing so they make the width of the rectangle changes.
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(10 votes, average: 3.40 out of 5)
Whoa that was weird and awsome too! i loved it! ^-^
hahahaha, cool