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"Mass Clocks" is a speculative-fiction category built around large-scale mechanisms of time—literal or metaphorical—that measure, regulate, or manipulate societies, bodies, and histories. Novels in this genre center on monumental timekeeping devices (mechanical, quantum, mystical, or bureaucratic) whose operation shapes politics, memory, and identity: city-wide clockworks that ration lifespan, astronomical chronometers that predict civilizational cycles, or rituals that sync communities to a shared temporal order. These books mix hard-SF explanation with philosophical meditation and often a mystery or power struggle as protagonists—engineers, archivists, priests, rebels—discover who controls the clock and what it costs to change it. Themes include control versus freedom, entropy and preservation, collective memory, and the ethics of measuring life; tones range from elegiac and introspective to tense techno-thriller. "Mass Clocks" supports diverse subgenres (political allegory, time-noir, mythic fantasy) but is unified by intricate worldbuilding around temporal systems and the human consequences of fixing time.

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