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Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality. They are more or less isomorphic to transformations of reality. The transformational structures of which knowledge consists are not copies of the transformations in reality; they are simply possible isomorphic models among which experience can enable us to choose. Knowledge, then, is a system of transformations that become progressively adequate.
--
Genetic Epistemology (1968) First lecture

 

Jean Piaget

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Of greatest significance to me has been the insight that I attained as a fundamental understanding from all of my LSD experiments: what one commonly takes as "the reality," including the reality of one's own individual person, by no means signifies something fixed, but rather something that is ambiguous — that there is not only one, but that there are many realities, each comprising also a different consciousness of the ego.
One can also arrive at this insight through scientific reflections. The problem of reality is and has been from time immemorial a central concern of philosophy. It is, however, a fundamental distinction, whether one approaches the problem of reality rationally, with the logical methods of philosophy, or if one obtrudes upon this problem emotionally, through an existential experience. The first planned LSD experiment was therefore so deeply moving and alarming, because everyday reality and the ego experiencing it, which I had until then considered to be the only reality, dissolved, and an unfamiliar ego experienced another, unfamiliar reality. The problem concerning the innermost self also appeared, which, itself unmoved, was able to record these external and internal transformations.
Reality is inconceivable without an experiencing subject, without an ego. It is the product of the exterior world, of the sender and of a receiver, an ego in whose deepest self the emanations of the exterior world, registered by the antennae of the sense organs, become conscious. If one of the two is lacking, no reality happens, no radio music plays, the picture screen remains blank.

 

Albert Hofmann

 

If everybody would agree that their current reality is a reality, and that what we essentially share is our capacity for constructing a reality, then perhaps we could all agree on a meta-agreement for computing a reality that would mean survival and dignity for everyone on the planet, rather than each group being sold on a particular way of doing things.

 

Francisco Varela

 

The influence of Meister Eckhart is stronger today than it has been in hundreds of years. Eckhart met the problems of contingency and omnipotence, creator-and-creature-from-nothing by making God the only reality and the presence or imprint of God upon nothing, the source of reality in the creature. Reality in other words was a hierarchically structured participation of the creature in the creator. From the point of view of the creature this process could be reversed. If creatureliness is real, God becomes the Divine Nothing. God is not, as in scholasticism, the final subject of all predicates. He is being as unpredicable. The existence of the creature, in so far as it exists, is the existence of God, and the creature’s experience of God is therefore in the final analysis equally unpredicable. Neither can even be described; both can only be indicated. We can only point at reality, our own or God’s. The soul comes to the realization of God by knowledge, not as in the older Christian mysticism by love. Love is the garment of knowledge. The soul first trains itself by systematic unknowing until at last it confronts the only reality, the only knowledge, God manifest in itself. The soul can say nothing about this experience in the sense of defining it. It can only reveal it to others.

 

Meister Eckhart

 

The influence of Meister Eckhart is stronger today than it has been in hundreds of years. Eckhart met the problems of contingency and omnipotence, creator-and-creature-from-nothing by making God the only reality and the presence or imprint of God upon nothing, the source of reality in the creature. Reality in other words was a hierarchically structured participation of the creature in the creator. From the point of view of the creature this process could be reversed. If creatureliness is real, God becomes the Divine Nothing. God is not, as in scholasticism, the final subject of all predicates. He is being as unpredicable. The existence of the creature, in so far as it exists, is the existence of God, and the creature’s experience of God is therefore in the final analysis equally unpredicable. Neither can even be described; both can only be indicated. We can only point at reality, our own or God’s. The soul comes to the realization of God by knowledge, not as in the older Christian mysticism by love. Love is the garment of knowledge. The soul first trains itself by systematic unknowing until at last it confronts the only reality, the only knowledge, God manifest in itself. The soul can say nothing about this experience in the sense of defining it. It can only reveal it to others.

 

Kenneth Rexroth

 

You are the only contemporary physicist, besides Laue, who sees that one cannot get around the assumption of reality — if only one is honest. Most of them simply do not see what sort of risky game they are playing with reality — reality as something independent of what is experimentally established. Their interpretation is, however, refuted most elegantly by your system of radioactive atom + amplifier + charge of gun powder + cat in a box, in which the psi-function of the system contains both the cat alive and blown to bits. Nobody really doubts that the presence or absence of the cat is something independent of the act of observation.

 

Erwin Schrodinger