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How Penrose and Escher played with perspective to create impossible shapes
How artists began to turn flat drawings into three-dimensional worlds.
See how some warships 'hid' behind bright geometric designs.
Why closing each eye seems to cause objects to move - and how this can help measure extreme distances.
How length, area and volume scale factors affect the size of model planes.
Can a team of archaeologists use scale to recreate this ancient ship?