What are the characteristics of the art of relief sculpture in the ancient Babylonian period?

The art of bas-relief is almost as old as Babylon, and bas-reliefs of some kind of subject have been found in the temples of various cities. The reliefs were engraved on square limestone slabs, and it is assumed from the fact that there was a gap in the center of the slabs that the slabs were made to be fixed in a certain place or hung on religious vessels in the temples.