Idk, I think more cities should invest in public art projects but this one seems pretty off. I get the concept. But if the idea is, "look what can be made with recycled plastic", why not make a sculpture that's actually interesting or pleasant to look at? It might've even been better if the rocks were just whatever color(s) they ended up being after they were made, but the based on images in the article it looks like they were made to literally just look like big rocks.

I feel like this project just does not achieve the goals it sets to meet. It's not particularly thought provoking (unless there's some sort of plaque that explains what it is, but who's reading that?), and the visual appeal can be replicated at a fraction of the cost with something that does not need to be maintained and has zero chance of causing environmental harm.