A touch-pressure sensitive panel includes a locally and resiliently deformable waveguide having an exterior surface for receiving localized touch pressure from a user, and a wetting surface opposite the exterior surface. The panel also includes a de-wettable layer presenting a de-wettable surface arranged beneath the wetting surface, such that the localized touch pressure reversibly increases localized optical wetting of the de-wettable surface by the wetting surface. The panel also includes an imaging detector configured to receive light coupled into the de-wettable layer due to the localized optical wetting.