A (often known by the brand name "Magic Eye") is a 2D image that creates a 3D optical illusion when viewed with a specific eye focus technique. While "Stereogramme.zip" likely refers to a specific collection of these images, the "detailed guide" below explains how to view and understand them. How to View Stereograms
The goal is to decouple your eyes' focus (clarity) from their convergence (where they point). Stereogramme.zip