Take the snake and put it on the car with the four wheels and let it return so often to the earth that the whole car sinks into the depths of the sea and nothing is left visible but the blackest dead sea.
Von Franz presents an alchemical text in which the car with four wheels functions as the central vessel of nigredo transformation, linking the image to the problem of the fourth function and the I Ching’s motif of removing wheels.
, Psychotherapy, 1993thesis