What you see is a randomly created Camera obscura, through a keyhole in our kitchen. There is no lens. Wikipedia explains it as: Rays of light travel in straight lines and change when they are reflected and partly absorbed by an object, retaining information about the Color and brightness of the surface of that object. Rays through a small opening form an image of that scene where they reach a surface opposite from the opening. We usually close all doors when its hot outside so today was the first time we ever witnessed this. Quite beautiful to see science happening in real life :)