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These four questions are all related to each other. Let's start to investigate from the easy question (d). In the case of (d), they
are called congruence shapes in mathematics. "Congruence shapes" are not
usually used for tiles and mosaics. Obviously shapes of the person pointing
to the right and the person pointing to the left are different as shown
in Figure 206 as an example. Thus, we have to answer the question (a)
"multiple", and have to answer the question (b)
"Yes." But, the space of the standing white person stretching both right
and left hands is white in the center should be excluded. As for question
(c), the answer is "true". Because the white shapes
appear alternately, the black shapes of the unit are clearly recognizable.
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