There are various indications that the left side, as one faces the portal, is more highly regarded than the right. Its entablature carries a rich interlace, while that at right is undecorated; the arcade in the middle zone is filled by a row of human heads, while that at right is filled with those of animals. The central sculpture in the lowest zone at left, which is set on a throne and projects significantly from the ground, clearly represents Mary with the Christ child; the former, as the "new Eve," holds an apple, while the latter holds the book of life. The reliefs at either side show human figures caressing each other, that is, in attitudes of harmony. The corresponding central figure on the lowest zone at right, on the other hand, is bracketed by aggressive, hostile beasts; this may represent the Antichrist.