What gets left behind when you move on

Part of the last thing comes with you into the next one.

Moving between two pieces of work is not like moving between two rooms. When you leave a task, some part of it stays active. You carry a residue of the previous thing into the new one: the half finished thought, the unresolved question, the mild irritation. You are now working on the second task with a portion of your capacity still standing in the doorway of the first. Nothing about the transition feels costly, which is exactly why the cost goes unbilled.

This residue is why a morning of many small tasks can leave you more tired than a morning of one large one, despite less having been achieved. Every switch adds a layer. By the eighth switch you are working through a fog of unfinished fragments, none of them individually significant, all of them collectively occupying room you needed. The tiredness is real and the output is thin, which is a demoralising combination if you cannot see the mechanism producing it.

The practical implication is not that switching is forbidden, because it obviously is not. It is that switching should be counted. A plan that has you moving between five different kinds of work in a morning is not a plan with five tasks in it. It is a plan with five tasks and four transitions, and the transitions are not free even though nothing on the schedule acknowledges them.