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A 3D stereogram is an image hidden in another image. Those who passed the exam for the driving licence, can have an idea about this, because they have tests examining accuracy and visual attention.

Still, 3D stereograms are quite different. They exam the ability of a person to emerge multiple objects into one. It's not the attention but the technique of viewing, that makes a 2D image to transform suddenly in a 3D one...like a miracle I would say. 

Even if I discovered the stereograms just a cupple of days ago, it seems they were discovered in 1838 by Charles Wheatstone. He also constructed a stereoscope, based on a combination of mirrors, to allow a person to see these type of images.

The principle, of course is not a miracle. It is based on the capacity of our brain to see objects in space, using both eyes and both cerebral hemispheres. 

The psychologists assume that genius people, have the capacity of using simultaneously, their both hemispheres with the same intensity,  and not only a dominant one. So watching 3D stereograms, will constituate in a good exercise for improving the rapidity of solving problems. On the other hand, it also improve self confidence, knowing that something can be changed by only changing the way of seeing it.

So, dear friends, can you see the dolphins from this image? :) Please try it

http://www.eyetricks.com/3dstereo78.htm

Another images are here: http://www.eyetricks.com/3dstereo.htm

Tips for Viewing Stereograms :http://www.eyetricks.com/stereograms/tips.htm

Enjoy! and please leave a line and say how do you feel about them 

For me...they are magical... and a tip of course, is to give them to teachers while supervising students during the tests :)

Wish a good day to all EC members!