Fall colors about to explode in Midwest September arrives like a vice squad busting a party, telling us the gig is up — get back to work and school. The pools, beaches and ball fields close down and we swap our shorts, T-shirts and flip-flops with grown-up clothing designed to conceal our bodies and end our fun. We follow obediently, because we know it isn’t nice to mess with Ma Nature. But there’s one consolation to this annual ritual marking the end of photosynthesis in 2009. The old girl puts on one last spectacular show, a display of natural fireworks bursting with sienna, umbria and other colors that sound more like Italian city states than dying leaves.