Over 40 works and 400 years of colour theory in one book. Each chapter offers overviews of publications with some background information about the author and a summary of the theory. Lots of beautiful illustrations and colour charts. The book is in three languages (English, German and French) which I didn’t realise in the store as the book was wrapped in plastic. Doesn’t go deep into each of the theories but is a good guide to original sources of colour theory.