Do you know what a stereogram is? It is a picture where you see only a pattern at first, but when you squint or see in the far, forms will pop-up (in 3Dimentions) from the image. If you have never seen that I would advice you to take your time and try to see the hidden information of the pictures.

Bigle 3D is a stereogram generator or SIS (Single Image Stereogram). To create you own stereogram, give a background, and a greyed image that contain the 3D information: So more an area is dark, so more it's far away. Everything is realised in a Wizard. You can save your stereogram under the main images format (BMP, PNG, JPG, TIFF…) and open even more types of images to create them.