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Keep Calm & Do Art Therapy
Spiral | Birthday Card | cardthartic.com
Inside Message: Happy trails to you, and all the best on your birthday. #cardthartic #greetingcard #birthdaycard #symbolism #stationary #meaningsoflife #greetingcards
I like this particular chart of the emotional, physical, and behavioral effects of different colors, but the whole post is one of the best explanations of color I've seen. Explanations here for primary, secondary, and tertiary colors, as well as complementary, analogous, triadic, and warm/cool colors.