The Gateless Gate, by Ekai, called Mu-mon, tr. Nyogen Senzaki and Paul Reps [1934], at sacred-texts.com
A monk asked Tozan when he was weighing some flax: "What is Buddha?"
Tozan said: "This flax weighs three pounds."
Mumon's comment: Old Tozan's Zen is like a clam. The minute the shell opens you see the whole inside. However, I want to ask you: Do you see the real Tozan?