This is one for geeks probably in terms of thinking about colour. It's a chronological journey in terms of his thinking about colour. Because it's 30 minutes, to get a feel for it, you might want to pick it up at 5:10 where he talks about the luminousity in the room; or 8:25 with the boy on the roof. The children with the crocodile also fascinating.
I do love his paintings - if you google his name and paintings you'll get a feel for his work.