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In these writings it is explained how the inverted image in a "collecting-point" or "treasure house" is inverted by an intersecting point (a pinhole) that collected the (rays of) light.
Light coming from the foot of an illuminated person would partly be hidden below (strike below the pinhole) and partly form the top part of the image.
In Arab and European cultures its invention was much later attributed to Egyptian astronomer and mathematician Ibn Yunus around 1000 CE.
The earliest known written record of the camera obscura is to be found in Chinese writings called Mozi and dated to the 4th century BCE, traditionally ascribed to and named for Mozi (circa 470 BCE-circa 391 BCE), a Han Chinese philosopher and the founder of Mohist School of Logic.
This is a remarkably early correct description of the camera obscura; there are no other examples known that are dated before the 11th century.
Lit objects reflect rays of light in all directions.
A small enough opening in a screen only lets through rays that travel directly from different points in the scene on the other side and together form an image of that scene when they are reflected on a surface into the eye of an observer.
A camera obscura device consists of a box, tent or room with a small hole in one side.
Light from an external scene passes through the hole and strikes a surface inside, where the scene is reproduced, inverted (thus upside-down) and reversed (left to right), but with color and perspective preserved.
Another more portable type is a box with an angled mirror projecting onto tracing paper placed on the glass top, the image being upright (but still reversed) as viewed from the back.