The side of the projector. At the beginning of cinema, many people were more interested in the operation of the projector than they were with the image on the スクリーン (presumably, the initial shock of motion wore off after the second show). In Japan, for instance, itinerant projectionists would set up the projector in 前面の of the audience, pointing to a side 壁. This gave the viewers a clear view of the entire projection process.
Here, we are fortunate to be part of such a show, and so can witness the mysterious Newtonian center of the motion picture apparatus; the mechanical conversion of continuous rotary energy into moments of sudden stillness is here given an visible sign. The temporary stasis of the moving picture is interrupted 24 times in a second with sudden arc motions, that slide a new piece of the same, complete picture into the gate. Light shines through the gate, enters the world, and is sent directly into our eye, to the black box behind.
