Not quite how I would use this for TOK but it’s really really cool.
“This one-of-a-kind book was created to demonstrate how watercolors could be manipulated to change shade when different measurements of water were added to the mixture. The concept of mixing one’s own colors as a primer on color theory will surely be familiar to any first-semester art student, but Boogert’s example is notable for its thoroughness — he filled approximately 800 pages with every example imaginable.”
TOK Topics 