Stereoscopic GIFs alternate between the left and right images of a stereogram, capturing the same image from two different vantage points positioned inches apart. Instead of layering the resulting images on top of one another to create a 3D effect, the artist turns them into animated GIFs, twitching ever so slightly from the minuscule difference in perspective. The resulting effect creates images that have a sense of depth and three dimensional quality to them, without the need for those annoying glasses. WARNING: Staring at the following images for more than a coffee break or two might cause serious damage to your workflow.
The next two are from Portland-based art director Matt Moore. You can check out his Tumblr here.