"In 1900 the stereograph was king. Its three-dimensional optics created a virtual presence for the viewer. Millions of Americans, especially schoolchildren, absorbed ideas about race, class, and gender from such 3D images...Drawing on an enormous, rarely seen collection of some 300,000 stereographic views spanning the first decade of the twentieth century, Michael Lesy presents nearly 250 images displaying a riot of peoples and cultures, stark class...