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December 2, 2013
The First Six Books of The Elements of Euclid in Which Coloured Diagrams and Symbols are Used Instead of Letters for the Greater Ease of Learners, by Oliver Byrne, 1847.
Make them from coloured paper or colour in the pieces yourself. Cut along the solid lines, fold along the dotted lines, glue together and you're done!
Posted by gerardvanderleun at December 2, 2013 3:18 PM. This is an entry on the sideblog of American Digest: Check it out.
Your Say
Aaaaww...do I have to?!
Posted by: RPF at December 2, 2013 8:14 PM
I think I'll stick to the letters.
Posted by: Vermont Woodchuck at December 2, 2013 10:29 PM