B'en, the reed, is thirteenth of the twenty, following Eb' the road: at a certain length a road needs something raised to hold it. Its glyph is a woven mat or a mature maize stalk — the Maya built roofs, wove mats and made staffs from reed and stalk, and the mat (pop) is the word for authority itself; the Popol Vuh's title means 'Book of the Mat'. So B'en is about support and authority: what holds up a roof, what others straighten themselves against.
So B'en's mechanism is structure and leadership: hollow, straight, jointed. Its power is holding — people stand straight beside you; its difficulty is holding too much — a reed holds a roof up, it doesn't carry it, and overloaded it snaps.
Where you'll recognise it: people naturally make you the pillar, responsibility toward home and tradition, an upright bearing, a clear sense of what ought to be done, difficulty showing weakness. Running well, you're the one who holds the room together: giving a group its skeleton, a home its post, shape to what was formless. Stuck, you're rigid or you collapse — holding until you can't bend, or holding until you break. In the sequence B'en is followed by Ix, the jaguar: what has been raised must next learn to wait quietly. Your next step isn't standing straighter. It's handing off some weight, and leaving room to bend.
