Bas relief depicting an Assyrian soldier crossing a river using an air-filled sheepskin bag.
https://s3-us-west-1.amazonaws.com/h...f_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...110#post172312
https://www.homemadetools.net/forum/...774#post133170
https://www.homemadetools.net/forum/...635#post136442