Sharing a room with your sibling feels endless. It’s actually the shortest lease you’ll ever sign.

Living in somebody else’s space feels permanent while it is happening and turns out to be brief. A handful of years of shared walls looks endless from the inside, and from the far side it is the shortest stretch you will ever spend living with that person. None of it feels temporary at the time. That is the trick of it, and it only becomes obvious afterwards.

You can carry on arguing about the mess; just know the clock is running. Have the late-night conversation this week instead of putting your headphones in. The room stops being shared sooner than either of you expects.