Imagine a world filled with sales robots that follow humans on the street while displaying a continuous stream of advertisements and commercials. Or imagine a place where robots try to sell their services to humans in a hyperaggressive fashion, without stopping their sales pitches even after being refused, on the grounds that they only obey their owners, so they will only follow the instructions (such as “go away”) of people who agree to purchase them. Science fiction writer Philip K. Dick dreamed up just such a world in his short story Sales Pitch, which was originally published in Future Science Fiction magazine in 1954.