The story we tell ourselves about distraction is that it is brief. A notification arrives, we look, we look away, we are back. Five seconds, gone. If that were true, distraction would be a rounding error, and none of us would worry about it.
It is not true, because attention is not a switch. It is a structure you build. When you settle into something demanding — a chapter, a problem, a draft — you spend the first stretch loading context: the names, the thread of the argument, where you were going. That structure is invisible and surprisingly fragile, and a single interruption can knock it over.
The tax is paid twice
So the cost of the glance is not the glance. It is the glance plus the rebuild. You pay once to look away and again to find your way back to the place you were standing, and the second payment is the larger one. Worse, the rebuild is rarely complete. You return to the page, but a thread is missing, and you read the same paragraph a second time without quite noticing why.
The expensive part of a distraction is not where it takes you. It is the road back.
Why a closed loop helps
This is the case for doing one finishable thing at a time, inside a container with edges. A focus session, a single summary, a fixed stretch with the phone in another room — the value is not discipline for its own sake. It is that an uninterrupted block lets the structure stand long enough to be useful, so you only pay the loading cost once.
You will not eliminate distraction; nobody does. But you can stop paying for it twice. Protect the second payment — the road back — and most of the cost takes care of itself.