Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!fluke!ssc-vax!chas
From: chas@ssc-vax.UUCP (Chas Boyd)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <1232@ssc-bee.ssc-vax.UUCP>
Date: 21 Feb 89 09:11:03 GMT
References: <6382@thorin.cs.unc.edu> <6511@cadnetix.COM> <14496@cup.portal.com> <14825@cup.portal.com>
Organization: Flight Technology, Boeing Aerospace
Lines: 27

In article <14825@cup.portal.com>, jxh@cup.portal.com (Jim - Hickstein) writes:
> While we're on the subject of human visual perception, specifically
> stereopsis, has anyone else noticed that their *perception* of 3-d,
> not just stereopsis, occasionally "goes flat" under
> stress of, say, sleep deprivation? ...
> -Jim Hickstein
> jxh@cup.portal.com
> ...!sun!portal!cup.portal.com!jxh

Rather, I tend to have the opposite problem, I combine flat surfaces to form
three-dimensional patterns: repeating patterns on a carpet seem to shift by
one or two "periods" and lift up vertically, as though a foot or two of water
was in the room.  This illusion is destroyed by things like walls, or furniture
or people "wading" through the waist-high translucent layer.

If you are careful you can even move around in this state, as long as you
don't look at walls, furniture, or your feet, or look down a different 
principle axis of the pattern.  (always look in the same direction).

Tile floors, or wallpaper work too.

(I was stranded overnite in the Charles DeGaule airport when I first noticed)
-- 
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