In school, I discovered a word that seemed to capture a fairly important idea: That sometimes, especially with professional tradesmen, there is a proficiency using a tool such that it seems to be an extension of the body. The word referred to "glasses", a tool that extends the body, but I believe it more accurately referred to tools such as a hammer or a bat. We used it to include things like Google and cell phones.
"Peter's ___________ allowed his pencil to work deftly though the pile of papers."
I have found lots of articles talking about such 'extensions' but I can't seem to find the word we used. This has been bothering me for years. I often want to talk about the concept but always get stuck on the missing word.