The old playhouse at my parents’ house looked smaller than I remembered, but somehow more important. It had been standing for about 30 years. I climbed on it as a kid, scraped my knees on it, hid underneath it, and probably tested every board harder than any safety inspector would recommend. Over time, the wood had softened, the decking had warped, and the railings had started to look more decorative than dependable. Still, the heart of it was there. The main structural beams