"The trouble is, we've been taught what to see and how to render what we see. If only we could be in the position of those men who did those wonderful drawings in Lascaux and Altimira!"

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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