The Colour of the Cave Walls

When I think of sort of Neolithic art like that, you don't see ultramarine and purple. You just see those sorts of earthy colours that are kind of reflected in the landscape. So the colours they use predominantly, the colours that you see on cave walls, are the colours that kind of occur most naturally and that they would have found around them. It is a... And you talk a lot about that book actually about how particular ... Certain colours are to do with royalty, for example, or the certain colours that we see in religious iconography, etc.