Thanks so much for posting my website here! Who knew hackers were so interested in colour! Someone just suggested adding paid courses as well, so I hope it's okay if I add that I also give a live online colour course that's not too expensive and has a lot of new material I've produced since finishing the main part of The Dimensions of Colour in 2017. There's a course outline here and a form if you want more information https://sites.google.com/site/djcbriggs/tmct