Color coding of proofs of Euclidean theorems

Mini post at the weekend :)

In Envisioning Information, Taft had an example about color coding.

Does everyone in school have geometry? Remember what all the theorems looked like in a textbook? Like this:
')


In 1847, Oliver Byrne, a school math teacher, um ... colored six classic Euclidean books on geometry. It turned out like this:



I rummaged through the Internet, found the scanned pages of this book and made a PDF of them. You can download if anyone does not mind 85 MB of traffic.

nordisk.pp.ru/on-line/files/+blog/83140BAF-4151-44E0-8DC7-C4D1D1BBDF7A/euclid_byrne.pdf