Building a camera obscura takes about an hour and requires the following things:
A big box, a piece of paper, spray adhesive (or glue), lots of duct tape, aluminum foil, a calculator, a pin, and a couple of sharpies.
Firstly, you must make the box light tight by duct taping, inside and out, every hole or gap that could let in light.
Next, I derived a formula for calculating the diameter of the hole in the aluminum foil.
Next, using spray adhesive, I adhered a piece of white paper on the back of the box onto which the image had a white screen to project.
And there you have it! After painting (or sharpie-ing) the inside black and attaching the lens, you have just built a camera obscura in about an hour!
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