7. Is this object moving and shimmering? Focus on the outermost grove and watch what happens.
8. Are they purple lines straight or do they bend? Since our eyes are drawn to the center, the purple lines look like they are curving. But look again because the lines are straight! This one is a trick of perspective.
9. In the two images, which central circle is biggest? Did you answer the left one? It sure looks that way, but in reality they are the exact same size. Since the left is surrounded by smaller circles, it dominates the image, making it appear bigger.
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