It has often struck me how many elementary actions go into even simple making tasks. If you list everything, right down to picking up your pencil and later putting it down again, the actions soon add up.
To put some numbers to this thought, I made the the video below. As I made a rebated butt joint between two pieces of corrugated cardboard, I spoke out loud each action that I was doing. Then I transcribed the speech recording, and added the words to the video, which is highly speeded up. According to my commentary, the whole job involved 109 separate actions. (This includes snapping off a new knife blade and squaring up the piece of cardboard at the start, and making a hash of a cut in the middle and doing it again later.)
What constitutes an elementary action is a matter of opinion. I simply broke things down such that I could commentate in an unhurried way. But an action such as picking up a knife involves several separate movements of your arm and hand. And if you consider that most of these movements involve the coordination of several muscles, it becomes clear that my simple glued joint was the outcome of a very complicated sequence of actions indeed.