>>> Try staring cross-eyed at this image for a while...
>>
>> <shrugs> I can't get any of those types of things to work, it's all a 
>> bunch of characters/dots/squiggles to me.
>>
> 
> I could never see anything on these. Both character-based and image-based.

The idea is to simply look at the image cross-eyed, so you see double, 
and make the repeats line up exactly.

The character-based ones are hard, because unless you have the right 
size typeface, it's almost impossible to see. Also, you can only 
generate fairly large steps in depth, which easily throws the illusion 
off. FWIW, the algorithm for generating random dot images is identical 
(but with colours instead of characters).

Try this:

ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEA
FGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJFGHIJF
KLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOKLMNOK
PQRSTPQRSTPQRSPQRSUPQRSUPQRUPQRVUPQRVUPQRVUPQRVUPQRVUPQRVUPQRVUPQR
WXYZaWXYZaWXYZWXYZbWXYZbWXYbWXYcbWXYcbWXYcbWXYcbWXYcbWXYcbWXYcbWXY
defghdefghdefgdefgidefgidefidefjidefjidefjidefjidefjidefjidefjidef
klmnoklmnoklmnklmnpklmnpklmpklmqpklmqpklmqpklmqpklmqpklmqpklmqpklm
rstuvrstuvrstuvstuvwstuvwsuvwsxuvwsxuvwsxuvwsxuvwsxuvwsxuvwsxuvwsx
yz012yz012yz012y012y031y031y4031y4031y4031y4031y4031y4031y4031y403
56789567895678956795679567#9567#9567#9567#9567#9567#9567#9567#9567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   *    *    *    *    *    *    *    *    *    *    *    *    *

The right half is completely blank, the left half contains a simple image.

If you cross your eyes, each little star at the bottom becomes a *pair* 
of stars. If you move your eyes such that the stars appear to exactly 
overlap, then you've either returned to normal focus, or you've unlocked 
the image. (The hard part is moving to look at other bits of it without 
going back into normal focus.)

Do this for long enough, and you will develop a nasty headache. ;-)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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