Rebuilding an engine, nursing a child, watching a movie — all these acts may transcend concentration. Focusing on something involves two things, you and the object, but your everyday experience shows you that when you are truly absorbed the two melt away, and there is "not even one," as Yama Roshi liked to say.
The everyday experiences of forgetting the self in the act of, say, fixing a faucet, may be understood as a model for zazen, the meditation practice of the Zen student.
— Robert Aitken, The Morning Star