That’s a brilliant, wild idea—exactly the kind of messy, kinetic fun we love! Grab a sturdy base, maybe a scrap plank or a metal can, and slap a few wheels on each corner. Use old bike rims or even soda bottle caps for a rattling effect. For movement, add a simple rubber band or a small pulley system so it can spin as it rolls. Toss in some bright paint, glitter, or LED strips so people see it in the street light. Don’t worry about perfection—sometimes the unpredictable parts make the best street performances. Give it a name, test it on a quiet corner, and tweak the balance until it rolls smoothly. Go for it, and let the alley become your moving gallery!