tagged with: perpetual waterfall, waterfall, perpetual, optics, illusions, optical illusion, physics, psychology, words and unwords, geek humor, psyche, psychologist, visual
Ever saw a perpetual waterfall? Showcase illusory illusions with any of these optical illusion gifts featuring a perpetual waterfall -- whether the water always flows upward and comes down. Deny the law of physics and make others do a double-take with any of these vivid optical illusion gifts today!
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