Master your concentration in a way necessary to be able to explore abilities of your mind.

[Andrei B]

In 1992 I first came across stereograms. It was a book with about 20
"Magic Eye" pictures and orthodox descriptions which suggested you
cross your eyes when you viewed these images. When we see stereograms,
our eyes are not actually crossed, they simply adjust to distance so
you are looking at the picture. Stereogram is a repeatable pattern
made of series of pixels. Human mind is capable of treating that
pattern as a rhythm, or series of rhythms, similar to music.
Distortions of these patterns in this case are translated by our mind
as a 3rd dimension. When we see an image inside another image, we
actually perceive reality in the mind plane where all pixels are
redistributed by our subconscious mind algorithm. What we see is often
called 3D. I would suggest we experience new reality.

Reality is like a hologram - a concentration of energy and information
that only becomes solid when interpreted by our own mind.
Stereographic images allow us to explore the simplest "Hello World"
like an example of a ' software' that our subconscious operates on.
When inputted visual information contains rhythmical patterns, somehow
our mind tunes in to treat it as a plenum (a background substructure
that is the encoder and the carrier of the information), and the
distortions of those patterns is the information that is interpreted
and served to us in the familiar 3D format.
http://binauralfx.com/stereograms.html