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  • I've never been able to see these things either. Ever.

    This explains why:
    http://www.colorstereo.com/texts_.txt/cant_see.htm

    The same for me. Once I worked out why I wouldn't be able to see them I spent a lot of time bluffing other people into saying that they saw more things than they really did. I invented details, the idea of double stereograms, pictures which changed dramatically when viewed upside down or across a different plane and my favourite, the oscilostereogram which changed when tilted (like those leaping tiger action pictures).

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