BROWNE, Alexander, Ars Pictoria : or an Academy Treating of Drawing, Painting, Limning, Etching. To which are Added XXXI. Copper Plates, Expressing the Choicest, Nearest, and Most Exact Grounds and Rules of Symmetry. Collected out of the most Eminent Italian, German, and Netherland Authors. By Alexander Browne, Practitioner in the Art of Limning. The Second Edition, Corrected and Enlarged by the Author, London, Arthur Tooker - William Battersby, 1675.1 quotations
It is reported then that Michael Angelo upon a time gave this observation to the Painter Marius de Scina his Schollar, that he should alwayes make a Figure Pyramidal, Serpent like, and multiplyed by One Two and Three, in which precept (in my Opinion) the whole Mystery of the Art consisteth, for the greatest Grace and Life that a Picture can have, is, that it express motion ; which the Painters call the Spirit of a Picture. Now there is no Form so fit to express this Motion, as that of the Flame of Fire, which according to Aristotle, and the other Philosophers is an Element most active of all others, because the Forme of the Flame thereof is most apt for Motion, for it hath a Conus or sharp Point wherewith it seemeth to divide the Aire that so it may ascend to his proper Sphere, so that a Picture having this forme will be most beautifull.