"Raphael and Titian seem to have looked at Nature for different purposes; they both had the power of extending their view to the whole; but one looked only for the general effect as produced by form, the other as produced by colour."

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Though colour may appear at first a part of painting merely mechanical, yet it still has its rules, and those grounded upon that presiding principle which regulates both the great and the little in the study of a painter.

— Joshua Reynolds