I took Euclidean geometry in high school, and having a book with colors like this would have made things so much easier to grasp. The color scheme is lovely too, and really makes me consider buying the poster. If you'd have told 15 year old me that I would one day really want a Euclid poster, I'd have called you insane!
https://mathcs.clarku.edu/~djoyce/java/elements/elements.htm...
Earlier this year (97 points, 3 months ago, 23 comments) https://news.ycombinator.com/item?id=46867018