For me, there's no other way to understand her photography without comprehending her continual hunt for secrets and mysteries. For her, the face of the earth is one glyph after another shrouded in shadows to be exposed and interpreted . . . Indeed, her hallmark is shadow, the sharp delineation of absent light. One could easily turn the etymology of photograph on its ear and call a Bridges aerial landscape an "umbragraph", where darkness explains things – or at least exposes them – far more comprehensively than light does.