The Museum's Extra Set of Footsteps

The museum at night is the best job I've had and the one I can't fully explain. Fourteen galleries, a great hall with a whale skeleton, marble floors that turn every footstep into an announcement.

You get used to your own echo fast. What took me longer was noticing the other one — a second set of footsteps, always half a beat behind mine, always stopping a fraction after I stopped, so that there was a tiny extra 'tock' in the silence after I halted. In the great hall, where the acoustics are enormous, it was unmistakable: my steps, then a shadow of steps, trailing, patient, following me on my rounds.

I did the sensible things. Recorded it on my phone — the second set is faintly there, offset, though skeptics say it's slap-back echo and I can't prove them wrong from audio alone. Walked erratically, stopped suddenly, changed pace — the footsteps matched with a follower's lag, not an echo's instant return. Echoes don't take an extra step after you've stopped. This did, once, twice, a full stride into the silence, before catching itself.

Here's the part that isn't only my ears. The museum installed pressure-sensitive mats in the high-value galleries — security upgrade, motion and weight logging. The overnight logs, which I only saw because a manager showed me during an unrelated fault investigation, record a second presence on my rounds. Consistently. My weight and route, and trailing it by a few seconds, a lighter reading, following the same path, gallery to gallery, stopping where I stopped. The manager called it 'sensor bounce' and I could see he didn't believe himself.