Juten, the master, once asked a monk, "Where do you come from?
The monk answered, "I come from a monastery on the western side of the river where Kwannon is enshrined."
The master said, "Did you see Kwannon?"
"Yes I did."
"Did you see it on the right side or the left side?"
The monk replied, "When seeing there is neither right nor left."
In a mondo like this, one can readily see that the question at issue is not Kwannon, which is used merely as a symbol for ultimate reality; and the seeing of it means Prajna-intuition. There is no differentiation in it of right and left; it is complete in itself; it is a unity in itself; it is "pure" seeing.
This monk apparently understood what Prajna-intuition was, and this form of question on the part of the master is known as a "trial" question.
---from "Studies in Zen" by D.T. Suzuki