Shoyoroku - Case 42: Nanyo and the Water Jug

A monk asked National Teacher Chu of Nanyo,
  "What is the essential body [1] of Vairocana Buddha [2]?"
National Teacher said,
  "Pass me that water jug."
The monk passed him the water jug. National Teacher said,
  "Put it back where it was."
The monk asked again,
  "What is the essential body of Vairocana Buddha?"
National Teacher said,
  "The old Buddha is long gone."

[1]: The so-called "Dharma-body" or dharmakaya.
[2]: The principal Buddha.