Amos Rapoport, in his book “The Meaning of the Built Environment. A Nonverbal Communication Approach” (1982, Sage publications, California) explains that as one moves into the domain of non fixed-semi fixed and fixed elements, the cultural variability and specificity tends to increase. An important issue is to discover urban and cultural cues that communicate particular meanings. Cultural cues include nonverbal behaviors, from intuitive ones (adaptors), to exact verbal translations with precise meanings known to all (symbolic gestures or emblems). In 1977, Rapoport listed some potential cues, and of course there are even more.
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