There was plenty of art strewn around Ravenna like this piece called Arpa Eolia. I believe it amplified people’s voices (but I didn’t get to try it out as there was a constant crowd around it).
Exterior Of Basilica Of San Vitale, Ravenna, Italy
The outside of the Basilica Of San Vitale isn’t as colorful as the inside but it is well worth a look. There are interesting arches and towers, plus tombs on the grounds.