![camera obscura](http://archivedphotos.com/wp-content/uploads/camera-obscura-image-projection.png)
From A. Ganot, Traité élémentaire de physique (Paris 1855).
Optical device that projects an image of its surroundings on a screen and traced by artisans.
Device consists of a box or room with a hole in one side.
Challenge of permanently capturing the fleeting images reflected in the camera obscura.
![wall projection](http://archivedphotos.com/wp-content/uploads/camera-obscura-image-projection-on-wall.png)
Camera Obscura