Colour determines almost everything we do. It operates on many different levels: visually, emotionally, cognitively. The sky, be it blue, white or grey, helps us decide what to wear. If a banana is green, yellow or brown it informs us if it can be eaten. According to neuroscientist, Anya Hurlbert, colours are linked to our ability to conceptualise, categorise and label. But we don’t all see colour the same way. Colour is slippery, mutable. It is our own personal possession, made in our own individual minds.