Artist Rodrigo Torres creates amazing 3D topographic sculptures of landscapes using a stack of 2D prints. This idea would be amazing for cityscape sculptures.

(via Craftzine)

Photographer Jim Sanborn has a project titled Topographic Projections and Implied Geometries Series in which he casts complex patterns over vast landscapes using a projector, and uses long exposure times to capture the scenes. The projector and camera are, on average, half a mile away from his landscapes, and on moonless nights he uses a searchlight to illuminate the scene.
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