1 ) You might be wondering why this is included. The black cords against a checkerboard background obviously form a spiral, right? Well, you'd be wrong. This is actually not a spiral. It's just many layers of circles. Try to trace each circle with your mouse cursor.
2 ) In the Zollner illusion, there are two sets of lines. Crosses on different lines create angling. Actually, these lines are parallel to each other.
3 ) A blivet is a paradox. When you look at it from the top, you see two descending rectangular rods. When you look at it from the bottom, you see three ascending circular rods.
4 ) This image is called "Rotating Snakes". Stare at this for a few seconds. Do the circles appear to move? This is a motion illusion; the circles look like they're moving, but they're stationary the whole time.
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