But what do those colours actually look like? Unfortunately, Jordan’s much-prized subject has not been available for media interviews. But once the abilities of the woman “with super-human vision” became known, many more potential tetrachromats have come forward who might be able to give us an insight.

One of those was Maureen Seaberg, a journalist and author in New York who took the genetics test after hearing Radiolab’s podcast on the subject. “I have always had polite disagreements with people about shades of colours,” she says. When clothes shopping for instance, she often finds that apparently matching tops and skirts seem to be a different shade to her, clashing horribly – even though no one else seems to notice it. Her sensitivity can sometimes be baffling to those around: when helping to restore a house, she once rejected 32 paint samples before settling on the right shade. “The beiges were too yellow and not blue enough, not cool enough; some of the almonds were too orangey,” she says – distinctions that were much to the confusion of her building contractor. Of course, that is only anecdotal evidence, but it perhaps tells us a little about the way that apparently identical shades could appear strikingly different to a tetrachromat.

Antico has a similar story. She says she has always known that her eyes saw the world differently to other people – a talent that was soon noticed by her family. “When I was a very little girl, my mother looked at me and said ‘You are going to be an artist and art instructor’.” Today, Antico has fulfilled that prediction, with her own gallery in San Diego, California, where she uses her enhanced vision to create vibrant paintings bursting with colour. Consider the following painting of a rainbow eucalyptus. “The tubes of paint were flying. The yellows, the violets, the lime greens – I was ferociously mixing on the palette trying to produce all the streams of colour in the bark,” says Antico. When compared to the real thing, the resulting canvas suggests that Antico is seeing more than the average eye.