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1 -- Introduction of spatial
thinking
(1) Works using shadows of shapes
Though our target is to describe patterns on a plane screen, the conception of spatial (three- dimensional) thinking is attempted to be introduced into the process of creating the patterns. Let's assume that there is sunlight. Then, each pillar located on the ground will have shadows. It may be interesting to draw patterns using shadows on the ground considering the arrangement of the pillars and the their height. There are many kinds of light sources which should be considered such as the sun which projects parallel lights; point light sources, like small light bulbs, which project lights like a spherical cone, and line optical light sources such as fluorescent lights. It is interesting to increase the number of light sources at fixed positions or to move the light sources. As discussed on the previous page, pillars are located in each block, and the way the lights project on them varies as shown in Figure 550-b. Although the position of the pillars is gradually changing, the mechanism to create the shadows is the same. Figure 551 of this page represents a bird's eye view when a solid model of a given height and arrangement changing regularly are assumed, and lights are projected from three directions. The light sources are point sources which project lights forming a light cone, and red lights are projected from the sky in the right backwards, left backwards, and right forwards, respectively. Only shadows are drawn in Figure 552, and there are two objects which are moving. The light source is fixed at a certain position. In Figure 553 the light source is moving, and the way that light
hits is complex. If the first row is taken as an example, the pillars were
illuminated from the side. Then, the pillars in the next row are illuminated
from an oblique backward direction, and the pillars in the third row are
illuminated from a higher backward position. The height and position of
the pillars changes delicately.
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