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Because we live our lives entirely in our own heads, understanding the contents of someone else’s — and how radically their experience might differ from our own — is hard. New research, though, is revealing just how diverse the human imagination can be.

Take the concept of a “mind’s eye”. You might take being able to conjure up mental images in your imagination as a given. But has shown that 1 to 4 per cent of the population have aphantasia, meaning they lack wakeful visual imagery – ask them to “see” a hippo floating down…