The Women With Super-Human Vision

As Concetta Antico took her pupils to the park for an art lesson, she would often question them about the many shades she saw flashing before her eyes. She would say: 'Look at the light on the water - can you see the pink shimmering across that rock? Can you see the red on the edge of that leaf there?' The students would all nod in agreement. It was only years later that she realised they were just too polite to tell the truth: the colours she saw so vividly were invisible to them.
Today, she knows that this is a symptom of a condition known as 'tetrachromacy.' Thanks to a variation in a gene that influences the development of their retinas, people like Antico can see colours invisible to most of us.