“When you have drawn the same thing so many times that it seems that you know it by heart try to do it without the model; but having a tracing made of the model upon a thin piece of smooth glass and lay this upon the drawing you have made without the model. …where you find that you have erred bear it in mind in order not to make the mistake again. …if you cannot procure smooth glass to make a tracing… take a piece of very fine parchment well oiled and then dried, and when you have used it for for one drawing you can wipe this out with a sponge and do a second.”

— Leonardo Da Vinci

The Notebooks of Leonardo Da Vinci (1938), XXIX Precepts of the Painter

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Leonardo Da Vinci 363

Italian Renaissance polymath 1452–1519

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“Take a piece of glass of the size of a half sheet of royal folio paper, and fix it… between your eye and the object you wish to portray. Then move it away until your eye is two-thirds of a braccio away from the piece of glass, and fasten your head by means of an instrument in such a way as to prevent any movement of it whatsoever. Then close or cover up one eye, and with a brush or a piece of red chalk finely ground mark out on the glass what is visible beyond it; afterwards, copy it by tracing on paper from the glass, then prick it out upon paper of a better quality and paint it if you so desire, paying special attention to the aerial perspective.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo Da Vinci (1938), XXIX Precepts of the Painter

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Leonardo Da Vinci 363

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