There's an installation in Carkeek Park this summer, and it's filled with site-specific (mostly) natural-element sculptures, integrating themselves into the landscape of the park.
There's a horrible map with no scale and too much information that doesn't tell you how to get to see any of them, so you must pretend you're on a scavenger hunt or you'll get frustrated and give up.
Nevertheless. When it's sunny and you feel like a wander in the city, this is the place.
My favorites are these here cardboard shelf fungi. They're so innocuous, so small, so perfectly placed around the fence line, you almost walk right by them.
Aren't they fantastic?