Ned Kahn's "Canopy of Sky" on Treasure Island is a kinetic sculpture made of thousands of small metallic leaves that catch the wind and move in unison — creating a shimmering, rustling canopy that sounds like a digital forest and throws constantly shifting shadow patterns on the ground beneath it. It's mesmerizing in the most literal sense of the word. You stop, you look down, and suddenly five minutes have disappeared.

For a city that has spent eye-watering sums on public art of, let's say, debatable merit, this one actually delivers. No plaque full of jargon about "interrogating the liminal spaces of urban consciousness." No baffling price tag attached to something that looks like it fell off a cargo ship. Just a genuinely beautiful piece of engineering and art that responds to nature in real time and makes people pause in their day.

Kahn has built a career on this kind of work — installations that harness wind, water, and fog to create something alive. "Canopy of Sky" fits Treasure Island perfectly, a place that's still finding its identity after decades as a military base and Superfund cleanup site. The island's redevelopment has been a long, complicated, and often frustrating saga of delays and cost overruns. But when you stand under Kahn's sculpture and watch the light dance, it's a small reminder of what the island could become when things are done right.

Public art doesn't have to be a boondoggle. It doesn't have to be a money pit dressed up in grant-application language. Sometimes it can just be a canopy of tiny metal leaves catching the San Francisco wind, making strangers stop and look up.

More of this. Less of everything else.