I was always a huge Muhammad Ali fan. One of my first art purchases was of his legendary fists. If only I had the room to fit this it would be mine.
Artist Michael Kalish created this 3-D portrait of The Greatest Of All Time out of steel, aluminum and ... speedbags. Damn, that's awesome. Wish I had built it, and I would have except the fact that it took 3 years to make does not play well with my A.D.D.
More info and a video at SwipeLife.