In the passage between the main room and the apse, under the two columns, is a mosaic with various motifs. In the centre, are two small mythological scenes. On the left is Hesione, liberated from the rock she was chained to and pointing at the mortally wounded monster in the sea, where it has been hit by Hercules arrows. To the right Endymion is resting in a meadow. He is pointing at the sky, from where Silenus will descent. A dog is sniffing around in the vicinity.