The drawings and symbols are carved out of sharp objects to emphasize the meaning of the stone plate. It could be hieroglyphics and the writing is probably reflecting the religious, political, or social aspects of the time. Art is an expression that is derived from the artists mind. Through an artists work they share their feelings and thoughts through that is hard for them to put into words. Art is letting the heart and mind take over your body through the hands, which is needed to create.
Art can produce reality, by reflecting parts of society or by trying to express individuality.
Art is a symbolic way to achieve this greatness. Human interaction is the way to challenge what our minds really have for us. This image from Classical greece shows a strong man eager to slaughter an animal, perhaps an ox. The animal has an expression of terror on its face while glancing at his killer who seems eager to slaughter. Strong man has an ax.