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Mountain or valley? Concave or convex? Why is it so difficult to tell the difference when you’re viewing a surface from directly overhead? This short animation from MinutePhysics details how this perceptual illusion is explained by our natural conditioning to the Earth’s most powerful light source – the Sun – which has trained us to perceive light as always being on top and shadows as always being on the bottom.
Video by MinutePhysics
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Death
Even in modern secular societies, belief in an afterlife persists. Why?
9 minutes
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Nature and landscape
Take a serene hike through an ancient forest, inspired by a Miyazaki masterpiece
6 minutes
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Design and fashion
The mundane becomes mesmerising in this deep dive into segmented displays
14 minutes
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Physics
A song of ice, fire and jelly – exploring the physics and history of the trumpet
9 minutes
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Spirituality
Trek alongside spiritual pilgrims on a treacherous journey across Pakistan
6 minutes
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Animals and humans
An artist and ants collaborate on an exhibit of ‘tiny Abstract Expressionist paintings’
5 minutes
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Mathematics
How a curious question about colouring maps changed mathematics forever
9 minutes
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Meaning and the good life
The world turns vivid, strange and philosophical for one plane crash survivor
16 minutes
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Art
Inside the unique creative space where ‘outsider’ artists find their form
14 minutes