The Cube Illusion I
The model consist of two squares. The first one is 15x15 cm and the second one is 7.5x7.5 cm.
When you concentrate your eyes on the corner of the internal cube you will see the internal cube "sitting" on the top of the big cube.
When you concentrate your eyes on the corner of the internal cube you will see the internal cube "sitting" on the top of the big cube.
Challenge
Optical Illusions