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. 2019 Feb 4;10:142. doi: 10.3389/fpsyg.2019.00142

Table 2.

Types of physical traces in the environment that wayfinders can use to infer the locations and nature of prior activities by other people.

Types of traces
By-Products of Use (erosions, leftovers, missing traces)
Adaptations for Use (props, separations, connections)
Displays of Self (personalization, identification, group membership)
Public Messages (official, unofficial, illegitimate)

Adapted from Zeisel (1981).