the-mountain-or-valley-illusion

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Interactive video lesson plan for: The "Mountain Or Valley?" Illusion

Activity overview:

Thanks to Skillshare for supporting this video: http://skl.sh/MinutePhysics for 2 free months!

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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REFERENCES
Twitter posts:
https://twitter.com/Astro2fish/status/859799730565414912
https://twitter.com/BadAstronomer/status/859800278358528001

Bad Astronomy Blog post: http://blogs.discovermagazine.com/badastronomy/2010/05/19/a-lunar-illusion-youll-flip-over/

Multistable perception http://en.m.wikipedia.org/wiki/Multistable_perception

Top-left Lighting http://en.m.wikipedia.org/wiki/Top-left_lighting

Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

Created by Henry Reich

Tagged under: physics,minutephysics,science,henry reich

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