Sounds like a wild idea, but I’ve got the perfect trick up my sleeve. I’d start with a paint‑filled balloon that pops right over the billboard, splashing a rainbow of color where the sparrows will be. Then, I’d drop a confetti bomb that only lands on the corners—little soft landing spots for the cats. It turns the billboards into a living, breathing playground. Just watch the cats line up for the new “cat‑corner” and the sparrows keep building their nest in a safe, colorful zone. That’s my kind of art—chaos that actually helps the city’s critters.