Sit and ponder the universe? Lean back in a chair and look skyward? Rub the soap in your crotch while in the shower and pause for an insight?
Marx, for one, would pace up and down the room. Paul Lafargue notes that Marx would rest by doing so, while Henry Hyndman observes: ‘Marx had a habit when at all interested in the discussion of walking actively up and down the room, as if he were pacing the deck of a schooner for exercise’. Engels had the same habit. Imagine the scene, especially after Engels managed to escape the ‘huckstering’ of the family firm in Manchester: Marx would pace in one direction, puffing on a cigarette, Engels would pace parallel to Marx but in the opposite direction, puffing on a pipe, while both would engage in animated discussion.
As for Lenin, Krupskaya notes: ‘When writing, he would usually pace swiftly up and down the room, whispering what he was going to write’. Then he would leap into the seat at his desk and rapidly write down what he had just whispered to himself. 45 volumes of Collected Works – that’s a shitload of whispering.