If you have a knackered old SLR lying around, game for a project and fancy adding a little quirk to your front door, why not think about creating a photography themed peephole?
Demonstrated here by Jared Polin of Fro Knows Photo, the installation seems pretty easy: you just need an old SLR and lens, some PVC, and, uh, the permission to drill through the door. At any rate, the video shows you what you need to know: get goin’! [Fro Knows Photo via Peta Pixel]