This is an interesting combination and well photographed! Is it an planned artistic installation, or a 'random' combination given by the location? This image reminds me of some ideas of the 'italian futurists' (the human body seen as machine or compared to machines).
Heinz, it's definitely a planned artistic installation. If you happen to visit Rome, it deserves a look. Here you can find some more detail: www.romeartwalks.photography