Art in the garden

My SO and I recently spent a few days in New York City. Among the sites and sights was the Highline. I didn't take photos of the plants - those may be viewed at their web site - but I did snap a few of the sculptures.

There was some "found art" in view as well.

I'm interested in introducing more art and hardscape, maybe even a water feature beyond my little fountain, to my yard and garden. This kind of display gives me ideas.