The piece left untouched may still influence where every other piece can go.

Something you have decided not to move still shapes everything around it. The piano nobody plays, the arrangement you will not revisit, the subject that stays off the table, each keeps setting the limits of what else is possible. Not deciding is a decision with effects. Fixed points do their work whether or not you look at them.

Find the immovable thing in a situation that feels stuck and name it out loud. Ask whether it is genuinely fixed or has simply never been questioned. Even if it stays exactly where it is, seeing it explains why everything else keeps having to bend.