“And it is the notions of reality and unreality themselves which finally become suspect when either one is mirrored in art, much less when both are mirrored together.”

Source: Grapefruit: A Book of Instructions and Drawings

This is Your Brain on Music (2006)

The Camelot Project interview (1996)
Context: When the legend is retold, it mirrors the reality of the time, and one can learn from studying how various authors have attempted to retell the story. I don't think we have an obligation to change it radically. I think that if we ever move too far from the basic story, we would lose something very precious. I don't, for instance, approve of fantasy that attempts to go back and rewrite the Middle Ages until it conforms to political correctness in the twentieth century. That removes all the benefit from reading the story. If you don't understand other people in their time and why they did what they did, then you don't understand your own past. And when you lose your past, you lose some potential for your own future.

Cubism was born

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

Source: The Heart is a Lonely Hunter

Mistakenly attributed to Vladimir Mayakovsky in The Political Psyche (1993) by Andrew Samuels, p. 9; mistakenly attributed to Brecht in Paulo Freire: A Critical Encounter (1993) by Peter McLaren and Peter Leonard, p. 80; variant translation: "Art is not a mirror held up to society, but a hammer with which to shape it."
First recorded in Leon Trotsky, Literature and Revolution (1924; edited by William Keach (2005), Ch. 4: Futurism, p. 120): "Art, it is said, is not a mirror, but a hammer: it does not reflect, it shapes."
Disputed

Attributed to Vladimir Mayakovsky in The Political Psyche (1993) by Andrew Samuels, p. 9; attributed to Bertolt Brecht in Paulo Freire : A Critical Encounter (1993) by Peter McLaren and Peter Leonard, p. 80
Variant translation: Art is not a mirror held up to society, but a hammer with which to shape it.
Disputed

Reality
Source: "I am That." P.36.