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rious inventions. It is as follows: when you look at walls mottled with various stains or stones made of diverse substances, if you have to invent some scene, you may discover on them the likeness of various countries, adorned with mountains, rivers, rocks, trees, plains, great valleys and hills in diverse arrangement; again, you may be able to see battles and figures in action and strange effects of physiognomy and costumes, and infinite objects which you could reduce to complete and harmonious forms. And the effect produced by these mottled walls is like that of the sound of bells, in the vibrating of which you may recognize any name or word you choose to imagine. I have seen blots in the clouds and in mottled walls which have stimulated me to the invention of various objects, and although the blots themselves were altogether devoid of perfection in any one of their parts, they lacked not perfection in their movement and circumstance.

50.

Obtain knowledge first, and then proceed to practice, which is born of knowledge.

51.

Knowledge is the captain, and practice the soldiers.

52.

The painter who draws by practice and by the

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