https://www.economist.com/democracy-in-america/2009/10/29/fr... "Friedman space" is a short story by Viktor Pelevin describing more or less that. The gist of it is

> in a parallel to the existence of an event horizon at the perimeter of gravitational black holes, the possession of extremely large sums of money sends a person into an altered zone of consciousness where, though they appear to others to be acting normally, their own perception of the universe is completely altered and incommunicable to observers