On the picture you see the tricky invention of the german cartoonist Adolf Hengeler, from the year 1896. He made a very useable proposal for the recycling of old worn shoes. If you like to test his invention, and build a bike like he has drawn for example, you will get surely a 100% Upvote from a lot of people, @rony007. I think, therefore you will become a very famous and popular Steemian!