The Well and the Donkey

The Reading:

Shoyoroku - Case 52: Sozan's "Dharma-body"

Sozan asked Elder Toku, "'The true Dharma-body of Buddha is like the empty sky. It manifests its form corresponding to things -- just like the moon on the water.' [1] How do you explain the principle of this corresponding?" Toku said, "It is like a donkey looking into a well." Sozan said, "You put it in a nice way, but you were able to say only eighty percent." Toku said, "How about you, Master?" Sozan said, "It is like a well looking at a donkey."

[1]: A quotation from a sutra.

Discussion:

This technique of pointing by showing the reverse of what someone has grasped onto, is there any meaning in it?  First, not everything is used for this reversal technique, and second, consider what it means in this case.  Which are you, the well or the donkey?  Which is the Dharma-body of Buddha?