When the sofa-complex of this 家 for the shapeless and future 死んだ leaves the frame, we follow and 発見する that they've gone off to the bathroom. Either that, or the elements of that other 部屋 have reshaped themselves into this bed/wall/toilet complex. Perhaps the new 壁 separating the two spaces is a スクリーン on which the bed and toilet watch each other.