From: CHARLES DITTELL     
To: OPUS                
Subject: Light          
Date & Time: 05/13/91 19:08:24
Message Number 16785

We gotta be careful here cause we're talking about two different
things: one is color, the other (which I'm focusing on) is white vs.
black. White is brighter: brightness is light intensity. We can 
objectively determine white from black by its intensity....