Boccaccio on Giotto

GIOTTO was of so excellent a wit that, let Nature, mother of all, operant ever by continual revolution of the heavens, fashion what she would, he with his style and pen and pencil would depict its like on such wise that it shewed not as its like, but rather as the thing itself, insomuch that the visual sense of men did often err in regard thereof, mistaking for real that which was but painted.

Wherefore, having brought back to light that art which had for many ages lain buried beneath the blunders of those who painted rather to delight the eyes of the ignorant than to satisfy the intelligence of the wise, he may deservedly be called one of the lights that compose the glory of Florence, and the more so, the more lowly was the spirit in which he won that glory, who, albeit he was, while he yet lived, the master of others, yet did ever refuse to be called their master. And this title that he rejected adorned him with a lustre the more splendid in proportion to the avidity with which it was usurped by those who were less knowing than he, or were his pupils.

Decameron VI 5. Translation by James M. Rigg.