This book was inspired by Georges Perec's Species of Spaces. 
The section of the book that stood out the most to me was "A space without a use". The following is an excerpt from it:

"Language itself, seemingly, proved unsuited to describing this nothing, this void, as if we could only speak of what is full, useful and functional. A space without a function. Not ‘without any precise function’ but precisely without any function;  [...] But, in the event, I haven’t succeeded in thinking of nothing. How does one think of nothing? How to think of nothing without automatically putting something round that nothing, so turning it into a hole, into which one will hasten to put something, an activity, a function, a destiny, a gaze, a need, a lack, a surplus…?"

It explores the notions of functionless space, void, readability and legibility.