Autostereogram: 3D images hidden in noise patterns

It is those images where you can see 3D hidden images if you cross your eye.

Link of it: https://en.m.wikipedia.org/wiki/Autostereogram

You can see a shark hidden in this image: https://en.m.wikipedia.org/wiki/Autostereogram#/media/File%3AStereogram_Tut_Random_Dot_Shark.png

It would be awesome to learn how to do it and create nice things with it :)