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July 1, 2017 AT 12:30 am

The Mountain or Valley Illusion #SaturdayMorningCartoons

via minutephysics

This video is about a multistable perceptual illusion, similar to the hollow face illusion, whereby maps or aerial or satellite photos look upside down/inside out, ie, concave (valley) parts look convex and convex (mountainous) parts look concave. Just flip the images around and things will make a lot more sense! It’s just because our eyes gauge depth based on the location of shadows, and the sun always casts shadows on the bottoms of things.

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