Motion after-effect

Try the motion after-effect. Stare at the centre of the spiral for 30 seconds and then look at your hand, or other small objects, and watch them grow.

28 March 2011

43 seconds

This clip is from

Bang Goes the Theory—Series 4, Episode 3

Dallas goes supersonic
Duration: 03:57
Andy Green interviews Ron Ayers
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Dr Yan and Peter Thompson talk illusions
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Without treatment a cholera patient could be dead in less than a day—Series 8, Disaster Relief
Duration: 01:40
The Standby Task Force—Series 8, Disaster Relief
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Have you got the cool head to work in the emergency response team?—Series 8, Trains
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Leaves on the track—Series 8, Trains
Duration: 02:13