Beautiful airplane, the Beech stagger wing - and good news for you Randy - they also have warbird cred! They were used as bombers during the Spanish Civil War, the Chinese (and the AVG) used them as medical evacuation planes against japan, and the US used them as the UC-43 (army) and GB-2 (navy). They were very popular for coastal anti-submarine work.
Now, on to biplanes. In broad terms the bottom wing is the "flying wing" and the top wing is the "landing wing." A main wing spar that is capable of working in a monoplane configuration (cantilever wing) is a difficult thing to build and when made if wood is a big, big thing. Back when engines were too weak or the exchange of horsepower for weight not good enough it was smarter and easier to build biplanes. The concept is simple. The bottom wing flies the airplane (lift and maneuverability) while the top wing keeps the bottom wing from warping in flight and keeps it in place when landing...but the bottom wing is actually two half wings simply bolted to a bulkhead in the fuselage. The whole thing is held together by wing struts and wires. The best part, biplanes are remarkable maneuverable. The worst part, the upper wing is almost pointless once in flight and blocks your view.
But there is a fix! Someone smart engineering guy figured out that wires could replace the upper wings if they provided the same "flying" and "landing" support through a diamond shape. The bottom wires allow the wings to "fly" while the top wires keep them from coming off at landing (or take off). This is where you get that other Art Deco classic the P-26 Peashooter (a beautiful airplane in my opinion). See the wires here: