“The world of experience, both physical and psychic, is entirely composed of elements - spatial, tactile, accoustical, thermal, etc. Combinations of these elements make up different "phenomena", both psychic and physical. If the law of causality, inferred for all these phenomena - i. e. for the world of elements connected by various relations - is applicable to "things in themselves" serving as an immediate link between "phenomena" and "things", it is clear that "phenomena" and "things in themselves" are of the same nature. "Things in themselves" would then represent a direct continuation of the world of empirical elements and in fact would be only combinations of elements.”

Interview with Gunther Schuller (1965, p. 34), quoted in Sound Structure in Music (1975) bu Robert Erickson; University of California Press. .
Context: I was not influenced by composers as much as by natural objects and physical phenomena. As a child, I was tremendously impressed by the qualities and character of the granite I found in Burgundy, where I often visited my grandfather... So I was always in touch with things of stone and with this kind of pure structural architecture — without frills or unnecessary decoration. All of this became an integral part of my thinking at a very early stage.

Source: "Outlines of the Science of Energetics," (1855), p. 121; Lead paragraph: Section "What Constitutes A Physical Theory"

volume I; lecture 35, "Color Vision"; 35-1 "The human eye"; p. 35-1
The Feynman Lectures on Physics (1964)

Source: Beyond Good and Evil

Source: A Manual of the Steam Engine and Other Prime Movers (1859), p. 31
Context: Hypothesis Of Molecular Vortices. In thermodynamics as well as in other branches of molecular physics, the laws of phenomena have to a certain extent been anticipated, and their investigation facilitated, by the aid of hypotheses as to occult molecular structures and motions with which such phenomena are assumed to be connected. The hypothesis which has answered that purpose in the case of thermodynamics, is called that of "molecular vortices," or otherwise, the "centrifugal theory of elasticity. (On this subject, see the Edinburgh Philosophical Journal, 1849; Edinburgh Transactions, vol. xx.; and Philosophical Magazine, passim, especially for December, 1851, and November and December, 1855.)

Source: Manual of Insight (1945), pp. 66-67

Scientific Study of So-Called Psychical Processes in the Higher Animals (1906).

Quote c. 1915 in 'Cubofuturism', Malevich, in his Essays on Art, op. cit., vol 2; as quoted in Futurism, ed. By Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 59
1910 - 1920

In 'The Non-Objective World: The Manifesto of Suprematism', 1926; trans. Howard Dearstyne [Dover, 2003, ISBN 0-486-42974-1], 'part II: Suprematism', p. 67
1921 - 1930