Something in the Mirror

This is a scan of one of my old Kodachrome slides. What I recall about the shot is looking through the viewfinder at the beautiful, late evening sky reflected in this absolutely flat, mirrored water. The problem was that there was nothing to give it any depth at all beyond the bushes on shore. That is until I got the idea to toss a pebble into the water. Suddenly, something totally featureless and indistinguishable was "there".