The A series 'push me pull you' gearshift

As was so often the case, Citroën's engineering approach to the 2CV's gearshift was unorthodox and clearly based on that of the Traction.
The gearbox in the 2CV was mounted behind the engine but sufficiently far forward to require the use of a remote gearlever.
The solution was a horizontal tube through which the gearlever could be pushed forwards and pulled backwards while being rotated within the tube.
Twisting the lever anti-clockwise and pushing it forwards selected reverse; pulling it backwards selected first gear. Thus the two gears used for parking manoeuvres were directly opposite one another.
The lever was spring-loaded in the second/third plane so pushing the lever forwards selected second and pulling it back selected third. No rotation is required. Thus the two gears for use in town were located directly opposite each other.
From third gear, rotating the lever clockwise and pushing it selected fourth gear (or overdrive as the company initially called it).