5 de Abril Bridge linking Lisbon across the River Tagus to its Southern suburbs. Visually this is an iconic structure and an important landmark, when walking along the waterfront, with its combined cycle and pedestrian paths. These are highlighted with super graphics, which contextualise the experience through reference to the local geography and history.
On approaching the underside of the bridge one becomes aware of a metallic roar, intensified by the evening commute, when this recording was made. The bridge then changes in our perception from a delicate object that celebrates human achievement to a representation of the imposition of human activity on the landscape.