Let's discuss an example which is described using figures on the two-page spread. The screen is composed of a concept containing shadow not exposed to lights and falling onto the ground turning red. The pillars are paired in each block. The change of these positions is changing according to a certain rule. The direction and the height of the light source are changing regularly exactly like the sun which moves with the change in time. The walls that determine the blocks are made of either thin walls with negligibly small thickness or of clear transparent materials which can only cut shadows. Figures 555 and 556 on the right page were created under such conditions.
 
 

554-a   554-c 554-b   554-d   Figure 554-a: Conceptual figure (see color illustration 33). Figure 554-b: Plane diagrams of the blocks. Figure 554-c: Configuration of pillars. Figure 554-d: Relationship between blocks and light sources.

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