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Photograph. i'm quite aware that that might sound like a crazy idea, to think that somebody was able to make a photograph 600 years ago. but when i started to look at the technology that was available at that time, i realize they had everything already. >> from his study of art history, allen knew that medieval artists already used an optical device called a camera obscura. >> it works exactly like a human eye. what we've here is a box which is sealed. no light can enter through it, except through this big hole over here. like a human eye, there is a lens. whatever is outside this box, it's fo...

>> from his study of art history, allen knew that medieval artists already used an optical device called a camera obscura. >> camera obscura work exactly like a human eye. what we have here is a box that is sealed. no light can enter into it except through this hole. like a human eye, there is a lens. whatever is outside this box is focused through this lens and forms an image on the back wall of the camera and it's inverted. in other words, it's upside down. >> the lens at the front of the camera ensures a sharp image is projected on the back wall. >> we know for a fact that this is very anci...

>> falling down. grenade went off immediately followed by gunfire. you could see people falling on the floor. some were diving for cover and some were actually falling. >> when i dived down to touch my chest and i checked. >> he had been having lunch on the terrace. >> i realized my wife wasn't actually behind me. i saw her falling on the ground clearly in a lot of pain. her legs looked very bloodied. i took her arm and dragged her towards the back wall of the restaurant so we could have a direct line on to the road. assuming it was a hit-and-run grenade attack and therefore being out of sight...

Had everything already. >> from his study of art history, allen knew that medieval artists already used an optical device called a camera obscura. camera obscura works exactly like a human eye. we have a box that is sealed. no light can enter through it, except for this hole. like a human eye, there is a lens. whatever is outside this box is focused through this lens and forms an image on the back wall of the camera, but it's inverted. in other words, it's upside down. >> the lens at the front of the camera ensures a sharp image is projected on the back wall. >> we know this is ancient technol...

>> camera obscura work exactly like a human eye. what we have here is a box that is sealed. no light can enter into it except through this hole. like a human eye, there is a lens. whatever is outside this box is focused through this lens and forms an image on the back wall of the camera and it's inverted. in other words, it's upside down. >> the lens at the front of the camera ensures a sharp image is projected on the back wall. >> we know for a fact that this is very ancient technology. there is no doubt that this technology was available in the late 13th and early 14th century, exactly when ...