A fascinating, centuries-spanning, global art history book of ideas. What I encountered challenged and pleased me in its given form, and I wish I could visit a major museum with walls soon, to be in the presence of a few masterpieces and muse upon/process what I've just read. Unable to do that, I'll be flipping through art books at home this weekend.
While Malraux and his publishers generously illustrated the book* with 172 photographs of works (many more sculptures than paintings), it would be well-served with a 21st century edition, an interactive e-book in which one could hover over any of the hundreds of works, artists, and cities named to see an image or summary descriptive text. That would make it more approachable for more readers, given the vast range of references Malraux cites.
*I read the 252-page Doubleday hardcover 1967 edition titled Museum Without Walls, which doesn't appear to be currently listed.