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If you enjoy visualizations of Euclidean geometry, I highly recommend the work of Byrne:

http://www.math.ubc.ca/~cass/Euclid/byrne.html

Example: http://www.math.ubc.ca/~cass/Euclid/book1/images/bookI-prop1...

(I found this to be one of the most impressive examples used by Edward Tufte in his books).

Byrne's Elements is pretty remarkable. It's an interesting juxtaposition of old 19th century typesetting (complete with initials) and comparatively "modern" graphic design. Some pages look like they could be right out of De Stijl.

Archive.org hosts a nice PDF copy, which I find more convenient than the jpegs: https://archive.org/details/firstsixbooksofe00byrn

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