This is the same viewed from below. You can see the light, the window glass, the rubber snake, the screen. Exposure time in this setup was about 20 minutes. But you may have to experiment to find the right exposure time as it varies from light bulb to light bulb, and also depends on how dark your image is (a rubber snake is 100% opaque so I could actually expose much longer; if I was to use acetate, that would depend on how black and opaque my acetate is... I usually produce two identical acetate and double them up to make them proper pitch black and be on the safe side).



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