The General Store is a prototype of an identical Martian facility, except for airlocks. (Snezhan Bodurov)
Shopping in the General Store is done while seated in a robotic cart - robots that move on rails between the floors and pick items from shelves. (Snezhan Bodurov)
Second generation robotic cart (Snezhan Bodurov). Note the telescopic arm used to grab items from shelves. This contactless selection of merchandise bears some similarity to today's online shopping that's become a reality.