In physical production (where it comes from), kanban is a lean method for ensuring that you don&#x27;t spend on producing right now something that is not needed right now.<p>It works by tokens that &quot;pull&quot; the production from other productive unities that are ultimately &quot;pulled&quot; from external (client) demand.<p>The article talks about all kinds of rituals and gains, but never once touches that &quot;pulling&quot; activity that is central to the concept, nor the lean objective.