Hekiganroku - Case 50: Unmon and the "Dust-Dust Samadhi"

A monk asked Unmon, 
  "What is the dust-dust samadhi [1] ?"
Unmon said,
  "Rice in the bowl, water in the pail." 

[1]: The word "dust" comes from the expression "six dust particles", which
     means the same thing as the "six objects" (cf. note to Case 47).