In the past few years, we have covered plenty of amazing 3D printed optical illusion here. This 3D Printable Impossible Slide Optical Illusion is also worth a look. It produces the illusion of the balling rolling uphill.
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Impossible Gravity Slide Illusion [Secret Revealed!]
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7 Mindblowing Optical Illusion Toys 😵 Gadgetify
You can buy the STL file to print this optical illusion slide on Etsy.
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