Nietzsche, interesting. Any idea which of his works specifically? A brief Google search didn't turn up much.
I've seen this analogy attributed to Fechner, who supposedly uses it in his Elements of Psychophysics (1860). This makes sense to me (without checking the source) because the Elements was very much about conscious awareness and sensory thresholds and the like. If true, that would probably predate Nietzsche. Man, that name is tough to spell. --- To make changes to your subscription go to: http://acsun.frostburg.edu/cgi-bin/lyris.pl?enter=tips&text_mode=0&lang=english
