Muhammad Ali proclaimed himself to be great and then went on to prove it. He was a flamboyant personality, known to brag about his achievements, past, present and future. That is probably why people think of Muhammad Ali as someone with high confidence levels and a big ego. His hands tell a different story.
Ali had a fleshy hand, with a rectangular palm and pronounced mounts of Venus and Moon. Lower Mars is developed, but not Upper Mars. His fingers are not