actually, the master asked about what the truth of the vase is. A vase is an object made to hold water. in zen thought, reality is a composition of the relationship between the subject and the object. By tipping the vase over, the objective truth could no longer perform its subjective function, and by leaving the room, and removing the subject altogether, the monk illustrated that the vase was nothing but the manifestation, of theconditions of the object(physical material) and the subject (creator of its use)