I have solved what color is, however ; I still have no idea about what line is.
The human being, creature of eyes, needs the image.
Just as iron rusts from disuse... even so does inaction spoil the intellect.
Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.
Ask advice of him who governs himself well.
Art is the queen of all sciences communicating knowledge to all the generations of the world.