With practice, this new mental map of color will become instinctive: you’ll likely find that it is much easier to create and manipulate color specified in HSL in your stylesheet code than hex or RGB. See also Three Ways You Should Be Using HSL Color In Your Site Today.
Sphere: Color Theory Visualizer
(via Psychology of color for designers – Design Leadership blog ) Color plays a major role in our visual perception as it influences our reactions about world around us. A fundamental grasp of color perception and psychology in graph and web design is therefore critical in ore to create palettes that evoke the appropriate audience reactions.