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Here are some images made by a famous artist called Abelardo Morell. They are made inside the camera obscura.
http://youtu.be/LutIudRhm10
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The camera obscura was officially made in china by the chinese in the 18th century and possible in the 17th century to.
The bin was also made by a bin with a lid so no light can get in also there is a small pinhole with a shutter but the pinhole can only be small otherwise if the hole was big the picture wouldnt work it wouldnt be right because in pinhole photography the top of the object the light would bounce of and down towards the bottom of the bin and the bottomof the oject would bounce up and go to the top of the bin and in the end the picture would be upside down.
The bin was also made by a bin with a lid so no light can get in also there is a small pinhole with a shutter but the pinhole can only be small otherwise if the hole was big the picture wouldnt work it wouldnt be right because in pinhole photography the top of the object the light would bounce of and down towards the bottom of the bin and the bottomof the oject would bounce up and go to the top of the bin and in the end the picture would be upside down.
This is why the pinhole should be small and also not let lots of light in otherwise the picture would not end out like this how we want it to or it will go wrong.