Welcome to the automated warehouse of the future

They call it "the hive," or "the grid." It's a huge structure that fills a warehouse on the outskirts of Andover, a small and quiet town in southeast England. It's impossible to take in at a single glance, but standing on a maintenance walkway near the building's rafters, you look over what seems to be a huge chessboard, populated entirely by robots. There are more than a thousand of them, each the size and shape of a washing machine, and they wheel about, night and day, moving groceries. Their job is to be cheaper and more efficient than humans, and they are very good at it.