A Pinhole Camera is a lensless, dark container with a pinpoint hole on one side and light-sensitive paper on the other. Light will travel through the hole and imprint an inverted image.
Multiple findings and uses of the "camera obscura" (dark chamber) was recorded by Chinese philosopher, Mo ti in the 5th century B.C, Aritstotle in the 4th century B.C., and Arabian mathematician/physicist Alhazen in the 10th century A.D.
The dark chamber also allowed Renaissance painters a drawing aid, the chamber's original use before scientists aimed to create permanent images. 
Pinhole cameras can be made from any light-light containers of square, or curved shapes like a simple box or cylinder container. The images of a curved surface will create a warped image.
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