'Photo' (light) + 'Graphy' (to draw) = Drawing with Light
"Camera" (Italian) = Room
Above is a print of a walk in Camera Obscura used by renaissance artists to trace images.
Camera (room) Obscura (darken)
A camera obscura uses the natural optical phenomenon that occurs because light travels in a straight line. The illustration shows how a well lite object outdoors image is projected through a small hole in a dark room the inverted image appears upside-down on the opposing wall.