An adequate knowledge of theology and cosmology is then indispensable to an understanding of the history of art, insofar as the actual shapes and structures of works of art are determined by their real content. Christian art, for example, begins with the representation of deity by abstract symbols, which may be geometrical, vegetable, or theriomorphic, and are devoid of any sentimental appeal whatever. An anthropomorphic symbol follows, but this is still a form and not a figuration; not made as though to function biologically or as if to illustrate a text book of anatomy or dramatic expression. Still later, the form is sentimentalised; the features of the crucified are made to exhibit human suffering, the type is completely humanised, and where we began with the shape of humanity as an analogical representation of the idea of God, we end with the portrait of the artist’s mistress posing as the Madonna and a representation of an all-too-human baby; the Christ is no longer a man-God, but the sort of man we can approve of.