(ii) Expressions of lines using points of light

Let's try to draw a line of light using points of light. If an illuminating point of moving light is found, and a long time exposure is made with the shutter on a camera set for bulb, a photograph of optical traces can be created. Figure 70 is a photograph of headlights and tail lights.

In this case, the camera position was fixed. However, since motion is relative, a photograph of light traces of a fixed light source can be take by moving the camera itself. Figures 71-73 are photographs of point light sources outdoors which were taken using such a method.
 
 

70 71   72 73   Figure 70: Traces of moving lights (lights of cars). Figure 71, 72, 73: Photographs of point-light sources taken by swinging                                     a camera (see color illustration 6 for Fig. 72).

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