As with any koan, if you worry away at a line of poetry, as opposed to worrying away at a line of anxiety in your head, eventually the riddle will be solved, at least for you.
This is the case of the three weeks maybe even a month thinking about the turban and the lessened floors. It seems now about the inevitable loss of information but with that the retention of wisdom. The lessened floors of the leaves are falling away (information), but also lessoned as in “lessons”: all the stuff that was drubbed into your head from the age of four which you stayed up nights learning for exams. Almost none of it accessible now.
But the habit of exercising impulse control in order to sit and study for those tests has paid off. Maybe.