I know this has been making the rounds on the interwebs, but it sure is amazing. In 1692, Dutch artist A. Boogert (which sounds like a fake name you give your substitute teacher to hear her say “A booger”? over and over while taking attendance) wrote a book about mixing watercolors, which he then lays out with amazing examples. Made even more amazing in that it is the only book (800 pages!) of its kind (never mass produced) so his work and examples were seen by next to no one.  Of course, some 300 (ish) years later, Pantone came along and stole his idea. I kid. You can see the entire high resolution version HERE. Pretty cool stuff.Xo.