This world allowed Asimov to play with two separate notions: the social customs of the Solarians and a further elaboration of robotics. Because Solarians do not like, and sometimes cannot endure, contact with other humans, they must learn to work with robots, and they have developed an unusual skill at it. They use robots to tend to the children (Solarians can scarcely bring themselves to touch, or even to mention, "the little animals"). Dr. Delmarre had even developed the ability to instruct a robot to spank a child, an action that could ruin a robot's positronic brain. Baley learns from Jothan Leebig the difficulties of building a robot capable of disciplining children. Baley suggests that throughout history the First Law of Robotics has been misquoted. It should read: "A robot may do nothing that, to its knowledge, will harm a human being, nor, through inaction, knowingly allow a human being to come to harm." The novel explores, as well, ways of using a robot to commit murder: instructing one robot to put poison into water and another to give it to a human; instructing a robot to hand a child a poisoned arrow; and instructing a robot to hand a woman its arm to use as a club when she is overwrought. In one episode, Baley orders Daneel to reveal himself as a robot to the other household robots so that Daneel will not interfere with Baley's plan, which Daneel thinks is too
dangerous and cannot permit. Baley wants to go about interviewing people in person.