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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
Computing and artificial intelligence
Who, exactly, authored this AI-generated spin on Alfred Hitchcock’s Vertigo?
Gender and identity
LGBTQ+ retirees celebrate their hard-earned self-acceptance at a belated prom night
Peering into the eerie world of plankton reveals a variety of vital creatures
When crushes become crushing – how to know if you’re in a ‘limerent episode’
A unique theatre performance explores what touch means in an age of lockdown
Human rights and justice
When the Sisters of Perpetual Indulgence canonised Derek Jarman
Ageing and death
How an end-of-life doula found her vocation as a companion for the dying
Artists can flourish after brain damage. What does this say about neurology and aesthetics?
‘Why does life have to be so complicated?’ A school trip to the world of work