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In the center of the town , on a high place , was a market where trading and business transactions took place . Other times , the piano is rolled to the center of the room and we sing anthems of glue and dance the dance of broken pieces . The horseman stands in the center of the corral , whip in one hand , rein in the other as the horse trots around him . We assume that a mesh cell belongs to a quadrant or octant if the center of the mesh cell is inside the bounding box . St. Ignatius was so acutely aware of the difficulty of this discipline that he places his meditation on " The Three Degrees of Humility " at the center of the " Spiritual Exercises , " calling for true indifference to riches , honors and even a long life in order to serve the will of God .