The Double Door

The artist Marcel Duchamp drew, in 1927, a curious door –actually it became a door to Duchamp’s studio at 11 rue Larrey in Paris– : a double door sharing one hinge, that would admit a person to one of two thresholds, but only one per admittance, so when it swings on its hinge and opens into one space, it closes the entrance to the other.
Note the simplicity of his image but the complexity of his concept. The concept involved is the “Threshold Experience”, and the image is the ‘double doorway...