If The Lighthouse Stops

Suppose the lighthouse stops one night and no ship is near enough to notice. The keeper has been dead for an hour. The bulb fails on schedule, then does not restart. The rocks remain rocks. The sea remains sea. The dark fills back in the way water fills a footprint, slowly and then all at once. Somewhere a different shore lights a different lamp, for reasons of its own. Nothing on the chart needs to change yet. Nothing ever will.