The post discusses the unique exhibition of stereographs that provide a three-dimensional perspective on the American Civil War as showcased by the New-York Historical Society. It highlights how stereographs, as a form of early photography, offer a novel insight into historical events, enhancing the viewer's connection to the past. The comments indicate a mix of nostalgia and curiosity, with users discussing the impact of visual media on historical interpretation and the importance of preserving such artifacts. There's also a recognition of how modern technology can revive interest in historical studies and presentations, making them more engaging for contemporary audiences.