Time is not fair. Between your favorite clock on a shelf and a cheaper one on the floor, physics quietly takes sides, because general relativity says gravity bends not only space but the rate at which time itself advances for each object.
That claim sounds like science fiction, yet metrology labs treat it as routine engineering, using atomic clocks and frequency standards to register that a clock positioned slightly higher in a gravitational potential ticks faster by tiny but measurable fractions, an effect called gravitational time dilation in the metric of spacetime curvature.
The unsettling part is that no mechanism inside the clock changes; what changes is the geometry described by the Einstein field equations, which dictate that proper time along the higher clock’s worldline is longer than along the lower clock’s path, so the elevated device accumulates extra ticks while both seem perfectly synchronized to the human eye.
This asymmetry is not a laboratory curiosity; satellite navigation systems must correct for it using relativistic adjustments to orbital clocks, or your position estimates would drift, meaning your living room already hosts a quiet hierarchy where the shelf clock ages just a little more generously than the one by your feet.
