A scientist working on an arcane problem must detach himself from the “normal” world and roam with his mind in a world of disembodied symbols that now you see, now you don’t. Any intrusion from the solid world of everyday reality can make that world disappear in an instant. It is for this reason that Freeman Dyson “hides” in the library when he’s writing and why Marcel Proust used to seclude himself in a windowless room lined with cork when he sat down to write À la recherche du temps perdu. Even the slightest noise could break the thread of his teetering imagination.