Interesting note about "Opus Geometricum". The picture shows an angel holding a square frame and the light ray that passes through it forms a circle on the ground. This is ALWAYS the case no matter what the shape of the hole that the light passes through as long as there is enough focal length between the hole (depending on its size) and the ground. When you walk in the woods you will notice that the light passing through the odd shaped spaces between the leaves forms perfect circles on the ground. This is the camera obscura effect and most people never realize it.
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Interesting note about "Opus Geometricum". The picture shows an angel holding a square frame and the light ray that passes through it forms a circle on the ground. This is ALWAYS the case no matter what the shape of the hole that the light passes through as long as there is enough focal length between the hole (depending on its size) and the ground. When you walk in the woods you will notice that the light passing through the odd shaped spaces between the leaves forms perfect circles on the ground. This is the camera obscura effect and most people never realize it.
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