London Transport, by Man Ray, 1938.
This epic poster, by the Surrealist artist Man Ray, recently fetched the highest ever price for a transport poster at auction. It is quite unlike any other poster in terms of both appearance and how it was made. The image is the product of a camera-less photographic process. This involved placing three-dimensional objects directly onto photographic paper and exposing them to light.
Dimensions: 20.5 x 33 inches