Paper wheel charts

During this mini project I was drawn to these paper wheel charts, know as volvelle, that where displayed within the collection. These wheels where created to have answers to lots of different things by the different layers of the wheel that spin around, for example the one on my cover picture tells the user about gardening and the best times to be plating different things in your garden. They are often used to calculate different things in a fun and clear manner as you are able to get the answer you want by spinning the wheel. Reinventing the wheel was a book in the collection which gives lots of examples of different wheels for lots of different things all with very interesting designs some where very old and there where also more modern designs displayed within the book.