Flaps on an airplane wing alter air flow either assisting with or decreasing lift depending on how they are set.  This aircraft parked in our yard had for a brief time some very decorative flaps as melting snow slipped off the airframe.

Lacy pieces of snow-turned-ice extended upward at a gravity defying angle.

So precarious was this overhang, that it collapsed while I was snapping! Boy, did I jump at the sight (through the viewfinder) and the sound!