Conversation

I don’t. I’m not sure there are great intuitions for this kind of thing. There’s not really a metaphor from real life, it’s hard to abstract something from concrete use cases, and the maths terms are all jargon
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`fold` is neat because you could think about taking something much longer than wider and folding it into a square. sort of similar for `absorb` (which is what I think Keccak calls its reduction step)
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