Ideas to think of are a set of rules that allow us to act socially in well-defined ways, such as speaking, listening, attending a dinner party, playing backgammon, and so on. They are buried beneath habits of doing, so that we become unconscious of them, or even become unaware that they exist.
Ideas to think of
Hillier, B. (1996, 2007), Space is the Machine: A Configurational Theory of Architecture. Space Syntax: London, UK. pp.194-196