The designs on the colossal sculpture of the aztec mother goddess coatlicue ( 3.4.16) are

The designs on the colossal sculpture of the aztec mother goddess coatlicue ( 3.4.16) are "symmetrical".

You may have seen depictions of mother goddesses previously. Rich, humane, and wonderful, are the pictures that normally ring a bell. However, the Aztec mother goddess, Coatlicue, appears to be extremely unique from the pictures you may be accustomed to seeing. The sculpture is made up of stone.

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An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.