Abstract: A flexible, circular, elastomer air foil that is a unitary structure has a central portion that droops downward when the foil is resting on a horizontal flat surface surrounded by an annular portion that is then convex on top and concave on the bottom when resting on a thicker perimetrical rim portion.

Abstract: In the touch-responsive indicator switch construction disclosed herein, an electrically energizable light source is viewable through a printed circuit contact assembly. In the contact assembly, an essentially transparent flexible polymer sheet is folded to provide three juxtaposed layers, a ring-shaped contact element on the top layer being deflectable through an aperture on the intermediate layer to make contact with a similar ring-shaped contact element on the bottom layer, the light source being viewable through the centers of the ring-shaped contact elements.