Analytic philosopher Ludwig Wittgenstein was asked in 1926 by his youngest sister to help plan her new house. He quickly became obsessed, taking a year to design the door handles, another for the radiators. Near the project’s completion, he demanded the ceiling be raised thirty millimeters to achieve his desired proportions. “It seemed indeed to be much more a dwelling for the gods,” wrote another Wittgenstein sister, “than for a small mortal like me.”