Human's ability to control the things around us has progressed
   from pre-history to today. This amazing chart shows the
   ''scale'' at which humans have been able to control stuff for
   our use. The charts go from pre-history to today. Each chart, at
   the bottom is ''tiny'' at the top is ''large'', the left is
   ''light'' the right is ''heavy''. It is a ''strength-density
   space'' chart. It's a way of looking at history you don't
   usually get taught - not quite like this.