Astronaut Chris Hatfield’s autobiography, An Astronaut’s Guide to Life on Earth, begins with him floating in the airlock, preparing to take his first spacewalk. "Poised on the edge of the sublime, I faced a somewhat ridiculous dilemma: How best to get out there?", he writes. "The hatch was small and circular, but with all my tools strapped to my chest and a huge pack of oxygen tanks and electronics strapped on to my back, I was square. Square astronaut, round hole.”