Insanity is relative. It depends on who has who locked in what cage.

The line frames “insanity” not as an objective medical fact but as a label applied by whoever holds power. By invoking cages and locking, it suggests that social institutions—prisons, asylums, schools, even families—can define normality by force, confining those who dissent or don’t fit prevailing norms. The quote also reverses the usual assumption that the confined person is necessarily the irrational one: if authority is arbitrary or unjust, the jailer’s certainty may be the true madness. In Bradbury’s recurring themes, this resonates with anxieties about conformity, censorship, and the way societies pathologize nonconformists.