Back when I noticed that this wall was revamped I immediately wanted to shoot it but also realized its very obvious 2-dimensional appearance/feel.
Initially I was looking for a way to frame a part based on the leading white arrows on different parts of this wide wall, without any other physical distractions. I walked past it many times over a long period of time but could not get that to work, basically because it is just too flat.
For me adding the ventilation holes and, especially, the recessed tube with its shadow was subtle enough to give it a more 3-dimensional character. Adding another, basically external, element would easily be too distracting in my opinion. I did not think about adding a shadow, though. A different framing (16:9 instead of 3:2) and a strategically place shadow on the right might have worked.