An empty room and a full one are not the same room. The objects in them are identical, the light is identical, and the experience of standing in the middle is so different that it is worth treating the two as separate places with separate rules.
What quiet actually changes
A quiet room removes the clock. In a crowded gallery there is always a faint sense of a queue behind the shoulder, of occupying a spot that somebody else is waiting for, and that sense alone shortens every encounter by several minutes. With the room empty, the minutes stop being rationed and the second half of an hour becomes available for the first time.
The second half of an hour is where most of the value sits. The first half is spent arriving, orienting and confirming. What follows is slower and considerably stranger, and it only arrives if nothing has interrupted.
Slow hours are not long hours
A slow hour and a long one are different things. A long hour is endured. A slow hour is one in which less happens per minute, deliberately, and it can be over far too quickly. Nicole Brachetti Peretti keeps noticing that the hours remembered most clearly from a year are almost always the slow ones rather than the full ones, and that the full ones leave very little behind at all.
The room has an hour of its own
Rooms have times of day that suit them, and these have nothing to do with opening hours. A space lit from one side is at its best when the sun is low enough to reach across the floor. A space lit from above behaves the same at every hour and rewards whichever hour is quietest. The art pages keep a running account of which rooms are worth which part of the afternoon.
What late October supplies
The last stretch of October supplies both conditions at once, which is unusual. The rooms empty out once the season's openings have settled, and the light drops to the angle that treats an old surface kindly. Those two things arriving together is most of why the month reads as the best looking weather of the year.
Nothing in this needs organising and none of it is a scheme for spending an afternoon. A quiet room simply does something that a busy one cannot, and the difference is large enough to be worth saying out loud. The reading notes report the same effect on long books, the journal keeps the month, and the earlier note on returning to a familiar work sits next to this one.