"I sometimes begin a drawing with no preconceived problem to solve, with only the desire to use pencil on paper... but as my eye takes in what is so produced, a point arrives where some idea crystallizes, and then a control and ordering begins to take place."

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The light for drawing from nature should come from the North in order that it may not vary. And if you have it from the South, keep the window screened with cloth, so that with the sun shining the whole day the light may not vary. The height of the light so arranged as that every object shall cast a shadow on the ground of the same length as itself.

— Leonardo da Vinci