Cathedral Rocks, height 2,660 ft., Yo Semite Valley, Cal., No. 537 from the series "Yosemite Valley, Cal."

Art Historical Context

Step into the majestic Yosemite Valley through J.J. Reilly's *Cathedral Rocks, height 2,660 ft., Yo Semite Valley,.* (No. 537 from the "Yosemite Valley Cal." series), an albumen stereograph captured between 1870 and 1876. This petite yet powerful image (each 7.7 × 7.3 cm) showcases the towering granite formations of Cathedral Rocks, their sheer scale evoked by the precise height notation—a nod to the era's awe for America's wild frontiers. As a stereograph, Reilly's work transforms flat photography into a three-dimensional wonder when viewed through a stereoscope, mimicking human binocular vision for startling depth and realism. Printed via the albumen process—coating paper with egg whites for luminous detail—it exemplifies 19th-century innovations that democratized scenic splendor. Stereographs like this were Victorian-era bestsellers, fueling tourism and conservation efforts for Yosemite, which gained national park status in 1890. Reilly, part of a pioneering cadre of photographers, immortalized Yosemite's sublime landscapes, bridging art and exploration. Gaze through this card-mounted gem at the Art Institute of Chicago's Photography and Media department, and feel the valley's timeless grandeur leap to life.