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pinhole projector for kids, how to make a pinhole projector for kids, the simple pinhole projector, what is a pinhole projector, pinhole projector how to make, pinhole projector with paper, build a pinhole projector, making a pinhole projector, how to create a pinhole projector, how to make a box pinhole projector, how does a pinhole projector work, pinhole projector hole size, physics of pinhole projectors