First built by the Italian firm Iso SpA in 1953, the Isetta microcar was known for its single front door used for entry and egress. In the event of a crash, the driver and passenger were to exit through the canvas sunroof. Several iterations were built under license by BMW, the French firm VELAM, De Carlo of Argentina, and Romi-Isetta of Brazil.
BMW Z1 retracting doors - GIF
McLaren 720S folding instrument cluster - GIF
Rolls-Royce retracting anti-theft hood emblem - GIF
Automatic retractable hardtop - GIF