“As far as I know, there is no proof whatever of the existence of an objective reality apart from our senses, and I do not see why we should accept the outside world as such solely by virtue of our senses.”

— M. C. Escher

1950's, On Being a Graphic Artist', 1953
Context: As far as I know, there is no proof whatever of the existence of an objective reality apart from our senses, and I do not see why we should accept the outside world as such solely by virtue of our senses. These reality enthusiasts are possibly playing at hide-and-seek; at any rate they like to hide themselves, though they are not usually aware of it. They simply do it because they happen to have been born with a sense of reality, that is, with a great interest in so-called reality, and because man likes to forget himself.

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M. C. Escher 32

Dutch graphic artist 1898–1972

Hans Christian von Baeyer (1938) American physicist

Source: Information, The New Language of Science (2003), Chapter 8, The Oracle of Copenhagen, Science is about information, p. 64

“Our brains have evolved mainly to deal with our body and its interactions with the world it senses to be around us. Is this world real? This is a venerable philosophical issue and I do not wish to be embroiled in the finely honed squabbles to which it has led. I merely state my own working hypothesis: that there is indeed an outside world, and that it is largely independent of our observing it. We can never fully know this outside world, but we can obtain approximate information about some aspects of its properties by using our senses and our brain.”

Francis Crick (1916–2004) British molecular biologist, biophysicist, neuroscientist; co-discoverer of the structure of DNA

The Astonishing Hypothesis (1994)

“The world doesn't make sense, so why should I paint pictures that do?”

Pablo Picasso (1881–1973) Spanish painter, sculptor, printmaker, ceramicist, and stage designer

“The sole "property" of matter with whose recognition philosophical materialism is bound up is the property of being an objective reality, of existing outside the mind.”

Vladimir Lenin (1870–1924) Russian politician, led the October Revolution

Materialism and Empirio-Criticism (1908)

“I don't mistrust reality, of which I know next to nothing. I mistrust the picture of reality conveyed to us by our senses, which is imperfect and circumscribed. Our eyes have evolved for survival purposes. The fact that they can also see the stars is pure accident.”

Gerhard Richter (1932) German visual artist, born 1932

Richter is questioning here the 'picture of reality'
Source: after 2000, Doubt and belief in painting' (2003), p. 87, note 13

“Once there is empathy, then there can be the feeling we call compassion. A version of the Golden Rule — Do unto others as you would have them do unto you — is found in most religious traditions. … and emergent from our sense of compassion, in mortal conflict with our insistent sense that we should win, is our haunting sense that things should be fair.”

Ursula Goodenough book The Sacred Depths of Nature

Source: The Sacred Depths of Nature (1998), p. 114

“The Western approach to reality is mostly through theory, and theory begins by denying reality — to talk about reality, to go around reality, to catch anything that attracts our sense-intellect and abstract it away from reality itself. Thus philosophy begins by saying that the outside world is not a basic fact, that its existence can be doubted and that every proposition in which the reality of the outside world is affirmed is not an evident proposition but one that needs to be divided, dissected and analyzed. It is to stand consciously aside and try to square a circle.”

Bruce Lee (1940–1973) Hong Kong-American actor, martial artist, philosopher and filmmaker

Source: Striking Thoughts (2000), p. 15 - 16

“We both are, and know that we are, and delight in our being, and our knowledge of it. Moreover, in these three things no true-seeming illusion disturbs us; for we do not come into contact with these by some bodily sense, as we perceive the things outside of us of all which sensible objects it is the images resembling them, but not themselves which we perceive in the mind and hold in the memory, and which excite us to desire the objects. But, without any delusive representation of images or phantasms, I am most certain that I am, and that I know and delight in this.”

Aurelius Augustinus book The City of God

XI, 26, Parts of this passage has been heavily compared with later statements of René Descartes; in Latin and with a variant translations:
The City of God (early 400s)
Context: We both are, and know that we are, and delight in our being, and our knowledge of it. Moreover, in these three things no true-seeming illusion disturbs us; for we do not come into contact with these by some bodily sense, as we perceive the things outside of us of all which sensible objects it is the images resembling them, but not themselves which we perceive in the mind and hold in the memory, and which excite us to desire the objects. But, without any delusive representation of images or phantasms, I am most certain that I am, and that I know and delight in this. In respect of these truths, I am not at all afraid of the arguments of the Academicians, who say, What if you are deceived? For if I am deceived, I am. For he who is not, cannot be deceived; and if I am deceived, by this same token I am. And since I am if I am deceived, how am I deceived in believing that I am? for it is certain that I am if I am deceived. Since, therefore, I, the person deceived, should be, even if I were deceived, certainly I am not deceived in this knowledge that I am. And, consequently, neither am I deceived in knowing that I know. For, as I know that I am, so I know this also, that I know. And when I love these two things, I add to them a certain third thing, namely, my love, which is of equal moment. For neither am I deceived in this, that I love, since in those things which I love I am not deceived; though even if these were false, it would still be true that I loved false things. For how could I justly be blamed and prohibited from loving false things, if it were false that I loved them? But, since they are true and real, who doubts that when they are loved, the love of them is itself true and real? Further, as there is no one who does not wish to be happy, so there is no one who does not wish [themself] to be [into being]. For how can he be happy, if he is nothing?

“When we attempt to understand the inmost nature of the outer world, we stand before it as before absolute darkness. There probably exists in nature, outside of ourselves, neither colour, odour, force, resistance, space, nor anything that we know as sensation. Light is produced by the excitement of the optic nerve, and it shines only in our brain; as to the excitement itself, there is nothing to prove that it is luminous; outside of us is profound darkness, or even worse, since darkness is the correlation of light. In the same way, all the sonorous excitements which assail us, the creakings of machines, the sounds of nature, the words and cries of our fellows are produced by excitements of our acoustic nerve; it is in our brain that noise is produced, outside there reigns a dead silence. The same may be said of all our other senses.

...In short, our nervous system, which enables us to communicate with objects, prevents us, on the other hand, from knowing their nature. It is an organ of relation with the outer world; it is also, for us, a cause of isolation. We never go outside ourselves. We are walled in. And all we can say of matter and of the outer world is, that it is revealed to us solely by the sensations it affords us, that it is the unknown cause of our sensations, the inaccessible excitant of our organs of the senses, and that the ideas we are able to form as to the nature and the properties of that excitant, are necessarily derived from our sensations, and are subjective to the same degree as those sensations themselves.”

Alfred Binet (1857–1911) French psychologist and inventor of the first usable intelligence test

Source: The Mind and the Brain, 1907, p. 25

“Why in this world of ours there should be so much suffering no one knows. But this we know; that, evil existing, the world being such as it is, we can win from evil, if we choose, an inestimable good, namely — the conviction that there is in us a power not of the senses, the conviction that spirit exists, and exists in us.
A sceptic may say that in a world ideally conceivable we might have secured this precious conviction without the necessity of undergoing the ordeal of pain. To which the reply is: that in a world ideally conceivable what he says may be true; but in the world as it is, with which alone we are concerned, we have ample cause for gratitude that we can turn suffering to such far-reaching account, that we can distil from the bitter root this divine elixir; that by manfully bearing the pains of the senses, inexplicable though they be, we are able to gain the certainty that a power not born of the senses exists in us, operates in us. It is this effect of pain that accounts for the serenity and peace of many patient sufferers, a peace and a serenity which surround their bed of misery with a kind of halo.”

Felix Adler (1851–1933) German American professor of political and social ethics, rationalist, and lecturer

Section 7 : Spiritual Progress
Founding Address (1876), Life and Destiny (1913)

“As far as I know, there is no proof whatever of the existence of an objective reality apart from our senses, and I do not see why we should accept the outside world as such solely by virtue of our senses.”

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M. C. Escher 32

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