in his novel "the trip of icarus" (1974) dilov described the fourth law of robotics, extending the original three laws proposed by isaac asimov to include: "a robot must establish its identity as a robot in all cases"." dilov stated that the reason for the fourth safeguard was that: "the last law has put an end to the expensive aberrations of designers to give psychorobots as humanlike a form as possible. and to the resulting misunderstandings..."