1) Which black rectangle is bigger?
Would you believe that they are both the same size?
2) Can you find the lowest step in this image?
How is this possible? It just keeps on going...
3) Are the circles on the inside or the outside of this image?
This image tends to flip-flop back and forth!
4) This is another one of those images that flip-flops back and forth as you stare at it!
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