ANN ARBOR, Mich. Ann Arbor-based collaborative artists Trevor Stone, Natalie Berry and their four-year-old son Felix have spent two months building an ever-changing basement box fort. Theyve transformed their basement into an interactive and immersive box fort full of gadgets, pulleys, masks, walls, windows, consoles and more. A close up of a corn on the basement box fort. Building the basement fort has been an opportunity for the family for meaningful family time. The family has been documenting their efforts with the box fort through videos and a blog.