UNED provides funding as a member of The Conversation ES. When we open our eyes, a myriad of colours immediately appears before us. But they are not merely a decoration of our visual world: they ...

After patient RDS (identified only by his initials for privacy) suffered a stroke, he experienced a rare and unusual side effect: when he saw something red, blue, green, or any other chromatic hue, he ...

In parts of the world, the day is divided into slabs. Words for hues are limited to just a handful. And directions include realms above and below. It is reassuring to think that, even in a world of ...