Make a Room Sized Camera Obscura

This web page by Giorgio Carboni explains how to easily and inexpensively project the view outside your window onto your wall by turning your room into a camera obscura. All you need is some duct tape, posterboard, and a lens.

…it’s best if the window faces a view with some activity, it can be entertaining to see cars moving and people jogging upside down across your wall.

Link, Via: Neatorama