The Black Box during the grand opening party on Nov. 2. Tenants of Portland’s first retail-ready shipping container development, located on Washington Avenue, include The Cheese Shop of Portland, North Optical, Campfire Studios + Mulxiply, Evangeline Linens, and All Those Who Wander Specialty Coffee Shop. The Black Box’s mission is to support small business owners in testing their products or services to a new market for the first time.