The Rites of Passage exhibits 3-fold liminality as concept of pattern elsewhere in tribal culture. Separation, transition, and incorporation (In his terms; pre-liminal, liminal, and post liminal). 4 rating was given for Gennep's rich description about tribal rites. It almost felt like reading a fantasy story, minus any narrative intention or sentimental value (You wish). It is the best to see this book as ethnography journal as it stands for, rather than an architectural study (which I vainly tried).
Architectural-wise, liminality is concept being brought to spatial activites everywhere, when a place functioned as transitional passage into a new place.
the book offers rites as sequential pattern that by looking at it in right way, it could, for example being used as tool in design procedure. For example the rites examine 3 parti of spatial position, exclusion, liminal, and incorporation, which can be placed in a design to increase sense of actor experiences about themshelves. But alas, more relatable knowledge and skill is needed before it falls into ilusory correlation. Nevertheless, general analogy of Van Gennep's ritual pattern is still proven to be relevant in design.
So the answer of, why was my ethno-architecture lecturer recommended this book is now being brought to light. The book sublimely talks about space. Somewhere in the place where there is no law and concept of morality is extraneous to ours, architecture was not a part of cultural expression. It was substance of rites, a full-functioned theater which orchestrates their life, at least in our perspective. They might not realized it, yet as depicted in Architecture without architect, it only visually interesting for us.
Gennep never talks about architectural output such as decorative ornament or the likes, he took more general example as "line drawn with ox blood" as mere transitional symbol, which represent basic idea of gateway. He pounds liminality in examples, and proves that there is finite pattern in each transition.
I love part about The Funeral and initiation rites. The chapters easily being most interesting component of the book. We are aware little about transition in term of tribal as well as in our urban space. We encounter space but we rarely experience liminal space because everything is pointed and contextualy should-be-fulfilling. So far, the book adjust my view about importance of liminality, wether we spatially in doubt and yet we have chances to choose.