It’s often described as buttery, because of the fatty coating to the nerve cells called the myelin sheath. In a living person, it’s fairly dense, but squishy (can be squashed into shape), but after someone dies, if the brain is removed then it is usually treated with some chemicals to preserve it. This makes it harder/firmer, and so the only brains I’ve ever seen in real life are treated in this way – but I think if someone had brain surgery, their brain would feel very soft.
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