Caine Monroy is a 9-year old boy who spent his summer vacation building an elaborate DIY cardboard arcade in his dad’s used auto parts store. Caine Monroy is a 9-year old boy who spent his summer vacation building an elaborate DIY cardboard arcade in his dad’s used auto parts store. Caine Monroy is a 9-year old boy who spent his summer vacation building an elaborate DIY cardboard arcade in his dad’s used auto parts store. Caine Monroy is a 9-year old boy who spent his summer vacation building an elaborate DIY cardboard arcade in his dad’s used auto parts store.