We give little appreciation to the marvels of engineering that form the foundation of the modern city, not to the road, the sewer, the power line. Perhaps the one infrastructure that gets its deserved attention is the bridge, probably due to its intrinsically graceful form framed against the backdrop of water and sky. Yet even then only half of it is admired. Everything below the deck, underneath its long shadow, is associated with the grungy, seedy part of the city. A bridge has two sides, in more ways than one. I wanted to capture the dramatic underside of Vancouver's bridges and celebrate them as cathedrals of human ingenuity.