Re: stereogram: small image of Saturn and its moons

In article <dljar1.770644942@giaeb>, dlj...@giaeb.cc.monash.edu.au (Dwayne Jarvis) writes...
> 
>>3-D space image, make your eyes go cross-eyed, left eye looking at the
>>left "o", right eye on the right "o" at the top of the image.  Saturn
>>and its moons will appear to be closer than the backround stars, and
>>the moons at various depths.
> 
>I dunno. I got the stars -behind- the planets only when I focussed
>outwards. Focussing in the cross-eye'd fashion made the stars apear
>in front of the planets. Weird X-).
> 
    [picture deleted]

You're right!  I just purchased two short books on stereograms and those
type of 3d pictures and it does mention the difference between the two
ways of viewing these images.  It calls them the parallel and the cross-
eyed techniques.  To briefly summarize a section of the book:  Looking
at the image one way (e.g. parallel technique) causes certain parts of the
image to stand out.  When the same image is viewed the other way (i.e. 
cross-eyed technique) the same sections now appear to recede into the image.
Using the wrong technique can cause certain images to appear nonsensical
(e.g. images of actual things rather than shapes or designs or something).
By the way, the cross-eyed technique tends to be easier because we can focus
our eyes in a much broader range when crossing them rather than attempting
to focus out at infinity (the parallel technique).

					-- James Marshall
					157...@ucis.vill.edu

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