Weaken eyes and simply "stare" at a picture, looking as though through it. When your eyes will cease to fix a sight at any certain point, try to fix this sensation. In some seconds the flat surface of the screen on your eyes will start to be inflated as though, giving rise to sensation of spatial depth. And, at last, you will see the volume image
The cross technics (> <)
Establish a pencil between your eyes and a picture. Look at a pencil tip. Then slowly increase distance between the screen and a pencil, approaching last to eyes. Having reached a correct position, you will see the volume image.




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