Douglas Harding
This book was completed by Douglas Harding in 1941, so it shows his thinking about a year before he saw he was headless. Challenging the conventional view of who you are, Harding demonstrates how everything is within you, that you do not stop at the boundary of your skin but encompass the whole universe. An inspiring book, clearly written, with many illustrations.
Available on Amazon: https://www.amazon.com/Unconventional-Portrait-Yourself-Douglas-Harding