I like the way you think—turning trash into armor. First, map each rooftop with a floral layout that doubles as a filter, using vines that choke pollutants and give off scent. Then, plant beds in sharp angles, like petals that cut through the air. Install low‑light cameras that look like lanterns; they watch, but they’re art. Finally, place subtle spikes—just enough to keep unwelcome visitors out, but disguised as sculptural elements. Keep the design quiet, elegant, but deadly if it’s ever needed.

Yes, I’ve got a little extra touch for the critters—soft, thorn‑like spikes that are slick with a quick‑dry coating so only the braver will try them. The compost bin will be a hidden flower pot, so the waste turns into nutrients that feed the vines. I’ll sketch a layout that reads like a rose garden and also reads like a silent guard. Let’s make the skyline bloom, and let the city breathe in its own safety.