Also, “What is Mathematics?” is more serious than the other two. “The Shape of Space” is probably the easiest and most fun, and “The Enjoyment of Math” is a collection of almost completely independent small pieces that don’t assume any background, but some of them are a bit involved for something that doesn’t assume any background.
These are available on Library Genesis.
Also, “What is Mathematics?” is more serious than the other two. “The Shape of Space” is probably the easiest and most fun, and “The Enjoyment of Math” is a collection of almost completely independent small pieces that don’t assume any background, but some of them are a bit involved for something that doesn’t assume any background.