This artwork is from Painted Music by Austin Chapman Schwager:
Violinist, Engineer, Amateur Radio Operator, Artist

“The primary color of yellow seems to be an excellent symbol for happiness.  Perhaps that is because it is a higher frequency than red but doesn’t appear as “hot.”  It is interesting how human beings perceive color.  Wouldn’t it be amazing to somehow transform music into the frequency range we can see?  What a concert that would be!  Yellow houses are cheerful, yellow flowers bring smiles, and seeing yellow cars, more easily than other colors, in a fog can be an advantage.  The yellow door of happiness invites your imagination to step through into the wonder of colors, what they really are, and why they are so delightful.”