Association: - Robustness, - usefulness. Question: - What do I process? Psychologically: The tractor or Trecker is a utility vehicle and in this sense a useful vehicle on the life. One comes with him though not fast, but in most situations at the head. He resembles a bull or elephant, also in usually hopeless situations further white one. Moreover, the romantic view of the country expresses itself in this symbol as it is liked with town-dwellers. (See also vehicles)