Another aspect of public transport that I enjoy is artwork. There's a lot to be seen from the train network, but this one's is near the ferry terminal at Teneriffe.
It might not be 'gallery-quality' art, but it's nice. A lot of people see it, and I'm sure it brightens their day.
It's certainly better than a plain brick wall, and better than motorist equivalent - a stream of roadside advertising billboards.