“Reality contains not only evidence, but also the means (such as our minds, and our artefacts) of understanding it. There are mathematical symbols in physical reality. The fact that it is we who put them there does not make them any less physical.”

— David Deutsch, book The Fabric of Reality

Source: The Fabric of Reality (1997), Ch.3

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David Deutsch20

British physicist 1953

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“The 'physical' does not mean any particular kind of reality, but a particular kind of denoting reality, namely a system of concepts in the natural sciences which is necessary for the cognition of reality. 'The physical' should not be interpreted wrongly as an attribute of one part of reality, but not of the other; it is rather a word denoting a kind of conceptual construction, as, e. g., the markers 'geographical' or 'mathematical', which denote not any distinct properties of real things, but always merely a manner of presenting them by means of ideas.”

Moritz Schlick book Théorie générale de la connaissance

Source: Allgemeine Erkenntnislehre, 1925, p. 27 i. ; as cited in: Adam Schaff (1962). Introduction to semantics, p. 83

“[A]ll our symbols have the same purpose; words are merely the symbols we use most commonly. The function of words in human thought is to stand for things which are not present to the senses, and allow the mind to manipulate them—things, concepts, ideas, everything that does not have a physical reality in front of us now.”

Jacob Bronowski (1908–1974) Polish-born British mathematician

"The Imaginative Mind in Art" (1978)

“Reality must be expressed by a physical symbol.”

Mark Tobey (1890–1976) American abstract expressionist painter

Bahai lecture, New York, October 30, 1951; as quoted in Abstract Expressionist Painting in America, W.C, Seitz, Cambridge Massachusetts, 1983, p. 10
1950's

“The proximate goal of all perception is what we can get our hands upon. If we traverse the distance that separate us from that which we see or hear and find nothing for the hand to manipulate, the experience is an illusion or a hallucination. The world of perceptual reality, the world of physical things, is the world of our contacts and our manipulations, and the distance experience of the eye and the ear means first of all these physical things. Physical things are not only the meaning of what we see and hear; they are also the means we employ to accomplish our ends.”

George Herbert Mead (1863–1931) American philosopher, sociologist, and psychologist

George Herbert Mead (1926). "The Nature of Aesthetic Experience." International Journal of Ethics, Vol. 36, No. 4 (Jul., 1926), pp. 382-393; p. 382

“Non-physical reality is called Parusa in Sanskrit or Universal Soul is an abiding reality. It is logical, but remains conceptual to our minds under we experience it’s realization within ourselves.”

B.K.S. Iyengar (1918–2014) Indian yoga teacher and scholar

Source: Light on Life: The Yoga Journey to Wholeness, Inner Peace, and Ultimate Freedom, p. 9

“(…) the bottom line is that if you believe in an external reality independent of humans, then you must also believe that our physical reality is a mathematical structure. Nothing else has a baggage-free description. In other words, we all live in a gigantic mathematical object—one that’s more elaborate than a dodecahedron, and probably also more complex than objects with intimidating names such as Calabi-Yau manifolds, tensor bundles and Hilbert spaces, which appear in today’s most advanced physics theories. Everything in our world is purely mathematical—including you.”

Max Tegmark book Our Mathematical Universe

Our Mathematical Universe: My Quest for the Ultimate Nature of Reality (2014)

“What appear to be the most valuable aspects of the theoretical physics we have are the mathematical descriptions which enable us to predict events. These equations are, we would argue, the only realities we can be certain of in physics; any other ways we have of thinking about the situation are visual aids or mnemonics which make it easier for beings with our sort of macroscopic experience to use and remember the equations.”

Celia Green (1935) British philosopher

The Lost Cause (2003)

“It remains a real world if there is a background to the symbols — an unknown quantity which the mathematical symbol x stands for. We think we are not wholly cut off from this background. It is to this background that our own personality and consciousness belong, and those spiritual aspects of our nature not to be described by any symbolism … to which mathematical physics has hitherto restricted itself.”

Arthur Stanley Eddington (1882–1944) British astrophysicist

Science and the Unseen World (1929)

“It is to this background that our own personality and consciousness belong, and those spiritual aspects of our nature not to be described by any symbolism… to which mathematical physics has hitherto restricted itself.”

Arthur Stanley Eddington (1882–1944) British astrophysicist

Science and the Unseen World (1929)
Context: It remains a real world if there is a background to the symbols—an unknown quantity which the mathematical symbol x stands for. We think we are not wholly cut off from this background. It is to this background that our own personality and consciousness belong, and those spiritual aspects of our nature not to be described by any symbolism... to which mathematical physics has hitherto restricted itself.<!--III, p.37-38

“Ego is a social institution with no physical reality. The ego is simply your symbol of yourself.”

Alan Watts (1915–1973) British philosopher, writer and speaker

Buddhism : The Religion of No-Religion
Context: Ego is a social institution with no physical reality. The ego is simply your symbol of yourself. Just as the word "water" is a noise that symbolizes a certain liquid without being it, so too the idea of ego symbolizes the role you play, who you are, but it is not the same as your living organism.

“Reality contains not only evidence, but also the means (such as our minds, and our artefacts) of understanding it. There are mathematical symbols in physical reality. The fact that it is we who put them there does not make them any less physical.”

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David Deutsch20

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