“In the visual arts, color theory is a body of practical guidance to color mixing and the visual effects of a specific color combination.” en.wikipedia.org/wiki/Color_theory
“…light and darkness, brightness and obscurity, or if a more general expression is preferred, light and its absence, are necessary to the production of colour… Colour itself is a degree of darkness.” brainpickings.org/2012/08/17/goethe-theory-of-colours
“Working with color while designing is really about creating another dimension in your medium. Choosing a successful palette creates a foundation for adding meaning and hierarchy to your design. “ robots.thoughtbot.com/Its-only-color