The Thread That Weaves. What you see above is the complete innards of the book, and beginning just below, each page from outside front to back. The last photo is a closeup of the little book stitched inside.
Wikipedia says this about wabi-sabi: "Wabi now connotes rustic simplicity, freshness or quietness, and
can be applied to both natural and human-made objects, or understated
elegance. It can also refer to quirks and anomalies arising from the
process of construction, which add uniqueness and elegance to the
object. Sabi is beauty or serenity that comes with age, when the
life of the object and its impermanence are evidenced in its patina and
wear, or in any visible repairs."