" When a pebble falls down a well, it is gratifying to hear the eventual plunk. If, however, the pebble only slips into darkness and vanishes without a sound, the effect is disquieting. In the case of a verbal echo, spoken word acts as the pebble and the subsequent repetition serves as “the plunk.” In this way, speaking can result in a form of “seeing"... "

― Mark Z. Danielewski