"No trace" conceptual origins and term
&quot;Wholeheartedness&quot; is the term we use in my Rinzai lineage.  In Japanese, you can probably get away with the term &quot;kanshin&quot; which loosely translates to &quot;the mind with no remainder&quot;.  Think of it as a mind that is so engaged, there's nothing left over that could be doing something else.  Like if you're hoeing beans, you are hoeing beans and not thinking about your taxes or whether Gincarlo Stanton will finally play a full season for the Yankees.
This is the place where not even a needle can enter.  It is a practice that is so close that no air can escape.