From: CHARLES DITTELL     
To: OPUS                
Subject: Colors         
Date & Time: 05/11/91 15:04:03
Message Number 16736

Re colors, not easy to "prove" that my perception of green is the 
"same" as yours. But I don't think that carries over to, say, white
and black (since "luminence" is a variable which we can, at least
on some level "measure" - i.e., we agree that there is more "brightness"
to white than gray)...