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Path: utzoo!linus!security!genrad!wjh12!bbncca!msimpson
From: msimpson@bbncca.ARPA (Mike Simpson)
Newsgroups: net.followup
Subject: Re: Are you seeing pink walls?
Message-ID: <386@bbncca.ARPA>
Date: Wed, 14-Dec-83 12:40:30 EST
Article-I.D.: bbncca.386
Posted: Wed Dec 14 12:40:30 1983
Date-Received: Thu, 15-Dec-83 02:36:15 EST
References: <153@cal-unix>, <159@hou2b.UUCP>, <145@wbux5.UUCP> <352@hound.UUCP>
Organization: Bolt, Beranek and Newman, Cambridge, Ma.
Lines: 25

**
        Somewhere in the misty eons of my memory, I remember
seeing an optical illusion somewhat similar to this.  There
was a picture of an American flag, with black stars on a
yellow field, and green and black stripes.  One was supposed
to look at this for about a minute, then quickly look at a
white wall.  Voila -- a regular (red-white-blue) American
flag!  The explaination (again, I'm relying on memory) was
that the cones in the back of the retina get tired when you
look at the same color for a period of time, and so the colors
get 'selected' out. 
	Flames to me, comments to the net.
		     Mike Simpson
		     msimpson@bbn-unix (ARPA)
		     {decvax,linus,wjh12}!bbncca!msimpson (Usenet)
-- 
		        -- cheers,
			   Mike Simpson
			   Bolt Beranek and Newman Inc.
			   Ten Moulton Street,
				   Cambridge, MA 02238 (USnail)
			   msimpson@bbn-unix (ARPA)
			   decvax!bbncca!msimpson (Usenet)
			   msimpson.bbn-unix@udel-relay (CSNET)
			   617-497-2819 (Ma Bell)