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Seeing things differently

Synaesthesia is a harmless condition for which patients almost never seek medical help. So why have we got an article and an editorial about it? Because as well as being fascinating, it turns out to be common—one in a hundred of us is a synaesthete. And if you don’t know what it is, you might mistake it for something serious. As David Eagleman beautifully evokes in his editorial (doi:10.1136/bmj.b4616), synaesthesia is “a fusion of different sensory perceptions: the feeling of sandpaper might evoke an F sharp, a symphony might be experienced in blues and golds, or the concept of February might be …