The basic physical element in stabilizing rocks is to have all the center of mass in one line. This is easier said than done; as the rocks have irregular shapes and sizes. For Michael Grab it is as simple as anything, considering that he creates these unbelievable structures using extreme concentration in a meditative method. For him, it is a ritual that boosts his mental comp, sure and the capability to create design artistries as illustrated in the images and the video on this page. Scroll down the page and see the video to feast your eyes.