These GIFS from David Alexander Slaager, otherwise known as General Dikki, will mess with your eyes (and possibly give you a headache if you don’t quit staring at them). The GIFs use a technique called stereoscopy. Stereoscopic images create the illusion of depth by presenting two images that are very slightly different from each other. Each image is presented to each eye and the brain combines the two images to create a single image that seems three dimensional. Slaagers GIFs quickly alternate between these two images nearly creating the same three dimensional effect.