The red squares are the same color
in the upper part and in the lower part of the "X"
The diagonal lines are parallel.
There are no gray spots at the corners of the squares.
The center circles are both the same size.
Wavy Squares? No!
The background of concentric circles makes the squares appear distorted.
Rotating Wheels
The circles appear to rotate when you move your head closer and further away from the screen while looking at the dot in the center.
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