Thought experiments or, in German, gedankenexperiments, are experiments that, for whatever reason, cannot be physically carried out, but must instead be conducted internally, via logic and reasoning, in the mind.
(I am translating as I go, here, and 'family' is the closest I can get to this sense memory of togetherness and connectedness)
p. 184 (while being inside the mind of a mouse)
[...] big guy who gave me a tiny little pipe and feeling something I'd never felt before: complete contentment, something similar to how you feel just after an orgasm, but more - where the whole world is a big, soft duvet and you're just about to go to sleep, and you feel as if nothing is will ever hurt you again. And lastly fuck you whore.