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Other examples introduced in the following two pages represent various ideas based on these concepts. Sticks and balls are combined in Figure 568, and they form more advanced hidden shapes. In addition to the illusion of hide-and-seek of two diagrams, the
natural transition of a diagram into another diagram which is hard to be
expected is added, as shown in Figure 569. This has increased in complexity.
Let's look at the second, third, and fourth columns from the left. The
columns are changed into a wall without notice when your eyes gradually
follow from one edge towards the other. Therefore, for example, we are
at a loss to really see the strange spatial relationships of the ball in
the upper central part.
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