It can also be described as a 'camera obscura'. It was one of the first ever image making devices! It is a tiny camera placed inside a dark environment (concealed space), it takes a photo through a small hole that looks out of the box. They are easy to construct. It is just basic image making through "the rectilinear propagation of light in all different directions". These cameras don't have a lens. (http://www.pinhole.cz/en/pinholecameras/whatis.html)
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Here are some examples:
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