pp. 140-141

There are pottery pieces that use only one human figure.

1 (p. 140):
A human figure is drawn by using the same technique and design used to create the thick clay band embellishments on the pottery body. The human figure blends into and becomes as one with other decoration patterns, giving it a sense of calmness.

2 (p. 141):
Pottery decorated with a realistic human figure, which is not seen in any other pottery. Small holes that appear to have been created with a twig or the like, and concave hands are features also found on clay figurines of the same period.

It seems that when clay figurines are used for pottery decoration, the pottery itself comes to represent the messages from the clay figurines.