The picture does not move actually
The ring of boats appears to rotate slowly clockwise.
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The "Dark Green" end is actually the same shade of green as the "Light Green" end. Don't believe me?
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Focus on the dot in the centre and move your head towards then away from the screen. The rings should rotate in different directions.
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The "Dark Green" end is actually the same shade of green as the "Light Green" end. Don't believe me?

Focus on the dot in the centre and move your head towards then away from the screen. The rings should rotate in different directions.
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