Hekiganroku - Case 47: Unmon's "Six"

A monk asked Unmon,
  "What is the Dharma-body [1]?"
Unmon said,
  "The six [2] can't grasp it."

[1]: (same note as Case 39) The body of the ultimate Truth (Jap. hoshin, sk.
     dharmakaya) or one of the three bodies of Buddha.
[2]: The "Six" means "six roots" (eye, ear, nose, tongue, body, consciousness),
     "six objects" (color, voice, odor, taste, touch, phenomenon), and/or
     "six functions" (see, hear, smell, taste, feel, know). Or it could be
     any other "six"-ness.