Concrete has long had a close relationship with the earth; as the favorite material for the creation of building foundations, one of its most common uses is effectively as a more reliable replacement for soil. In the twentieth century, concrete’s ability to transform our interaction with the ground was taken to the next step. As architects and engineers explored the opportunities offered by a combination of reinforced concrete and the modernist mindset, multiple attempts were made to replace the ground in a more dramatic way: by creating a new ground, separated from the earth itself. Most widespread among these plans was the engineer’s elevated highway which emerged worldwide, and the most relevant to architects the “streets in the sky” embodied by developments such as the Smithsons’ Robin Hood Gardens. Newcastle-upon-Tyne offers a city-wide example of this theory, embarking on an ambitious plan to become the “Brasilia of the North” by creating an elevated network of pedestrian routes entirely separated from the automobiles below - though the project was abandoned in the 1970s with only small sections implemented.
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