Trurl and the construction of happy worlds. Trurl is not deterred by the cautionary tale of altruizine and decides to build a race of robots happy by design. His first attempt are a culture of robots who are not capable of being unhappy (e.g. they are happy if seriously beaten up). Klapaucius ridicules this. Next step is a collectivistic culture dedicated to common happiness. When Trurl and Klapaucius visit them, they are drafted by the Ministry of Felicity and made to smile, sing, and otherwise be happy, in fixed ranks (with other inhabitants).