00:00He folded the cardboard into a small box, then poked a hole through one side.
00:05The tiny hole funneled light rays into straight paths, creating an upside down image inside the box.
00:13And a chemically treated burning glass plate caught that light, the image onto them, turning the cardboard into a camera.
00:21He built it while trapped in a prison camp to show what was happening inside.
00:27and while others stood watch, he photographed starving prisoners,
00:32Then he wrapped the photos in a waterproof cloth and buried them until the war ended.
00:39They were released decades later, showing what really happened inside these camps.
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