Classicly

Alarm Clock is a science fiction story by Everett B. Cole. Many years had passed since the original country rock had been broken, cut and set, to form solid pavement for the courtyard at Opertal Prison. And over those years the stones had suffered change as countless feet, scuffing and pressing against once rough edges, had smoothed the bits of rock, burnishing their surfaces until the light of the setting sun now reflected from them as from polished mosaic.