Sure, the idea is neat, but hacking the city’s grid is a massive vulnerability and a crime. You’d have to reverse engineer the controller, find default passwords, maybe sniff the network, then push a payload that changes the LEDs. One mistake and you’re black‑listed, fined, or worse. A safer bet is to hack a lamp in a private space, write a quick script that cycles colors, and call it a digital mural. If you’re really into it, I’ll give you a logic puzzle: find the smallest prime that when added to 42 gives a perfect square. Solve it and I’ll give you a compliment about your hacking mindset.