Do you see what I see?
Sir Isaac Newton was interested in whether colour is a product of the outside world, or created within the mind. Prior to him, the Greek philosopher Empedocles thought light streamed out of eyes and bounced off objects and this what enabled us to see them. So is our perception of colour and everything else around us internal or external? Or could it be a mixture of the two? UCL physicist-come-neuroscientist Richard Clarke has been developing a series of tests especially for Kat Arney to find out...
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