“Tell me one last thing,” said Harry. “Is this real? Or has this been happening inside my head?”
Dumbledore beamed at him, and his voice sounded loud and strong in Harry’s ear even though the bright mist was descending again, obscuring his figure.
“Of course it is happening inside you head, Harry, but why on earth should that mean that it is not real?”
—J. K. Rowling, Harry Potter and the Deathly Hallows
I.

Source: Chloe Blanchfield, flic.kr/p/9AZChS
Whatever else Douglas Hofstadter’s I Am a Strange Loop might be, in its sixteenth chapter, “Grappling with the Deepest Mystery,” it becomes something like a spiritual memoire.
Strange Loop is Hofstadter’s attempt to explain human consciousness and personal identity through many elaborate analogies, the most pertinent being Kurt Gödel’s incompleteness theorem, showing that the mathematical language in Bertrand Russel and Albert Whitehead’s Principia Mathematica was capable of making self-referential statements despite the authors’ best attempts to prevent that from happening. His thesis is that human consciousness—or personal identity or what he calls a “soul”—is a self-referential pattern. A representational system that is capable of perception and categorization (in Hofstadter’s view, perception necessarily involves categorization) should be capable of perceiving and categorizing itself, and perceiving itself perceiving itself, and so on, and this self-perception will get “sucked into the [feedback] loop and cycle around and around, like a tree limb picked up by a tornado.” In other words, a soul is a pattern of thoughts that refers to itself, updating its model of itself as time goes by.
A consequence of Hofstadter’s view of the self—a consequence I happen to find convincing—is that a human brain contains more than one soul. Specifically, because I have representational models in my mind of everyone I know, I have a fragment of their pattern in my brain; if a person is their pattern, then in a very real, literal sense they inhabit my brain. His privileged example for this is a married couple, specifically he and his now-deceased wife Carol (content warning: in many cases Hofstadter seems flippant about serious mental disorders, in this case postpartum depression):
…Our oneness-in-twoness started to emerge clearly in my mind on several occasions during the first year of our marriage, right after we’d had several friends over for a dinner party and everyone had finally left and Carol and I started cleaning up together. We would carry the plates into the kitchen and then stand together at the sink, washing, rinsing, and drying, going over the whole evening together to the extent that we could replay it in our joint mind, laughing with delight at the spontaneous wit and re-savoring the unexpected interactions, commenting on who seemed happy and who seemed glum – and what was most striking in these post partyum decompressions was that the two of us almost always agreed with each other down the line. Something, some thing, was coming into being that was made out of both of us.
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