This kind of mechanical device where there are more than two shafts are always cool. Classic video about differentials from 1937 (!): https://www.youtube.com/w

This kind of mechanical device where there are more than two shafts are always cool. Classic video about differentials from 1937 (!): https://www.youtube.com/watch?v=yYAw79386WI https://www.youtube.com/watch?v=yYAw79386WI