While leading Amazon, Bezos famously railed against the company adopting a “Day Two” mindset. It’s always Day One at Amazon, Bezos decreed, meaning the company—now worth $2.2 trillion—had to always act like a start-up, never transition into maximizing margins at the expense of customer satisfaction.

Elon Musk aims to make life multiplanetary, but Jeff Bezos believes we should be building massive cylindrical space stations.