Neil Harbisson has a condition that means he only sees in greyscale. Throughout his life people would talk to him about colour, but when your world is entirely black and white, it's very difficult to understand. But when he was at university Neil met another student and together they developed an antenna that would translate colours into music notes. Neil underwent a controversial surgery to have the antenna permanently implanted in his skull. He now considers himself a cybernetic organism - a cyborg.

Image: Neil Harbisson with his antenna

Credit: Lars Norgaard