Although in order for robots/agents to have properly meaningful, naturalistic interactions with humans they need to co-create a language of gaze and other joint attention cues:
https://link.springer.com/chapter/10.1007/978-3-031-19679-9_...
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https://link.springer.com/chapter/10.1007/978-3-031-19679-9_...
https://slate.com/technology/2014/02/typing-indicator-in-cha...