The divine injunction included the prohibition of every representation of God by the hand of man. Deuteronomy explains: "Since you saw no form on the day that the Lord spoke to you at Horeb out of the midst of the fire, beware lest you act corruptly by making a graven image for yourselves, in the form of any figure...." It is the absolutely transcendent God who revealed himself to Israel. "He is the all," but at the same time "he is greater than all his works." He is "the author of beauty."
Source: Catechism of the Catholic Church (Vatican.va)