Kafka, for example, couldn’t bear to be near even his adoring fiancée while he worked:
You once said that you would like to sit beside me while I write. Listen, in that case I could not write at all. For writing means revealing oneself to excess; that utmost of self-revelation and surrender, in which a human being, when involved with others, would feel he was losing himself, and from which, therefore, he will always shrink as long as he is in his right mind.… That is why one can never be alone enough when one writes, why there can never be enough silence around one when one writes, why even night is not night enough.
Intentionally so. In his memoir, he offers this advice to kids who aspire to great creativity:
Most inventors and engineers I’ve met are like me—they’re shy and they live in their heads. They’re almost like artists. In fact, the very best of them are artists. And artists work best alone where they can control an invention’s design without a lot of other people designing it for marketing or some other committee. I don’t believe anything really revolutionary has been invented by committee. If you’re that rare engineer who’s an inventor and also an artist, I’m going to give you some advice that might be hard to take. That advice is: Work alone. You’re going to be best able to design revolutionary products and features if you’re working on your own. Not on a committee. Not on a team.