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