Blasts from the past were like the rooms one entered and re-entered in dreams: they would not stay nailed down. When you returned to them, they had changed - they suddenly had more space or a tilt or a door that had not been there before. New people were milling around, the floors undulated, and the sun shone newly, strangely in the windows, or through the now blasted-open ceiling, or else it shone not at all, as if having fled the sky.