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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 focused through this lens and forms an image on the back wall of the camera that is inverted. in other words, it's upside down. >> the lens...

>> from his study of art history, allen knew that medieval artists already used an optical device called a camera obscura. >> it works 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 of this box is focused through this lens an forms an image on the back of the camera obscura. it's inverted, in other words, 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 technology. there is no doubt that this technology w...

Everything already. >> from his study of art history, allen knew that medieval artists already used an optical device called a coamera obscurea. >> it works 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 focused outside of the box is focused through the lens and forms an image on the back of the camera. it's inverted, in other words, 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 technology. there is no doubt t...

>> from his study of art history, allen knew that medieval artists already used an optical device called a camera obscura. >> it works 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 focused outside of the box is focused through the lens and forms an image on the back of the camera obscura. it's inverted, in other words, 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 technology. there is no doubt that this techn...

>> check your equipment. >> go, go, go, go, go. >> get down! >> get on the ground! >> get on the ground! >> get on the ground now! >> i want them out. put your hands on the back wall. let's go! >> come on down here and have a seat. i want you to sit down, take your hands off your head. gentlemen, those of you sitting on the floor, there will be no talking. >> open 17. >> you, have a seat right there facing the glass. >> when we came in what we did was fired a bored thunder. basically it's a flash bang and a shotgun round. that's to get their attention and to get them to understand we mean busi...