-----Original Message-----
From:   Dr. Imre Bartfai [SMTP:root@PROF.PMMF.HU]
Sent:   Friday, March 31, 2000 9:02 AM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: [OT] Personal Optical Resolution

Hi,
excuse for trying to connect to this interessant topic, I'd have a
question:

there are a lot of so-called "magic images" - I even saw a book filled
with them - which are actually grey spots. It is said that looking this
pictures with somehow relaxed eyes true images occur. I did never manage
to see such hidden image. How does it work? Does it require some personal
skill or training (or maybe inborn gifts)?

Thank you in advance.

Regards,
Imre

A lot of people just can't see these pictures.  They are called SIRDs (something like Single Image Random Dot stereogram).  Usualy the best way to visualise them is to force your eyes to focus on a plane behind the picture, so effectively you are looking through the picture, not at it.  After a while you should see an image start to form, however if you move your eyes too quickly it will dissapear.

Mike Rigby-Jones