A clear block division runs down the middle of this image. Interestingly the details of the figures cross the line somewhat awkwardly. The head of the figure to the left and that of his horse do not cross over this line - if anything the line goes around the soldier's head. This could indicate that the carving of this scene was done on the ground before these blocks were installed, perhaps with only small details (like the horse's ear) being added once it was in place. The other possibility is that the joint between blocks was not very tight and so the carvers working on this scene avoided carving key features of their design across it. This kind of evidence for an awareness of block divisions is very rare in monumental carving at Rome prior to this period.