Site and Motion 1. The wooden wall was in the shadow of the sun at the time I took the photograph. But because the particles of the light are out of the sun, we can still see the shadow part. At the edge of the building, the particles from sunlight and the eaves are mixed, which make the edges look blurry. 2.Particles as the most basic elements, they can be regarded as the same in the macroscopic aspect. While the different number of particles constitute different kinds of object. Glass is transparent and reflective but fragile, and the stone is strong but opaque. 3.All of the object is not an eternal existence, because particles are constantly absorb and release. When the sun shines directly into the glass, the particles of light are reflected, making the glass into a state of disappearing. The surface of the actual object covered by the virtual cloud which is constituted by particles. These particles run from one object’s track to another object’s. So when we take photos from the building, the particles of the pinhole camera, or the film or ourselves, may participate in the composition of the building’s virtual cloud. Photography object must be a genuine thing, painting can be fabricated, something that did not appear on the front can be drawn. This kind of thing would be positioned in the camera but photography. Refer is the fundamental of photography. We often say that the invention of photography is a painter, but photography was invented by a chemist, photography is the essence of the existed.