If you’re in the possession of 3D red/blue glasses, now is the time to put them on. In 2003, the American Museum of Natural History digitized a sample from the approximately 1500 stereoscopic negatives produced by Herbert Lang during his six-year stay among the Mangbetu hundred years ago. The original glass plate negatives featured two side-by-side images made by a stereo camera (one for the right eye and one for the left). For more information about the conversion into anaglyph form click here. You can browse the gallery here.