I can't remember when I began dreaming in the Mall, so I'm going to put it down a cropping up in 2009 at the absolute latest.
The Mall is a shopping mall that is dubiously infinite, both in width/length and height. The walls are white chrome, and the entire building has a very sanitized feeling to it. The escalators are made of floating panes of thick glass. I can't see anything out of the windows besides a bright white void.
There are several rooms throughout the Mall, spaces for shops what are always either empty or out of order. There is a food court, but it sells nothing. Nobody appears to be employed at the Mall.
The only part of the Mall that deviates from this pattern is a single red door. The location of this door is usually within my line of sight when the dream begins, and it's very hard to find once I've missed it. This red door is typically weathered in extensive ways (rusted, chipped, dented, and clean burr holes that may be caused by a drill of some kind), as are the concrete stairs behind it.
Unlike the clean aesthetic of the rest of the mall, the stairs behind the red door are moldy, slightly damp, cracked, discolored, and stained with various things. Cobwebs dip from the ceiling, and it smells very musky. There is no light in this stairwell, the only visibility coming from the light in the Mall.
An illustration of the mall can be found on my tumblr blog here.
The Mall is filled with a hubpopulation of what I'm going to be henceforth referring to as the Mannequins. True to their name, mannequins are living white plastic-skinned people without faces, often wearing black wigs and white clothes of different styles- To the best of my memory, as time passes it seems to remain in the Era of late 2000s form with v neck t shirts and low rise jeans.
The Mannequins behave a lot like NPCs who's only purpose is to wander in a set direction. They do not seem to acknowledge me, and I have not seen them speak, eat, or react to stimuli in any other way- despite sometimes traveling in groups, they don't even speak to or acknowledge each other. They often have bags or white paper cups with lids and straws, but I have never seen them shop, and the bags and cups appear to be empty.
DEFINITE
1) The Mall cannot be endered. I have never seen the outside of the Mall, and I have never found myself in the Mall through reasonable transitions between other hubs or filler dreams.
2) Closed shops are one way portals. The shops without signs or lights take me to filler dreams or other hubs. I have accessed almost every hub from one of these shops at least once before (Including the street), with the exception of The Labyrinth and The Pool. There are no portals to the Mall, and so any portals appear to collapse with no hope of return as soon as I walk through them.
INDEFINITE
1) Do not enter the red door. The red door has resulted in decreased room quality, but no general ruining or termination of the Mall as a hub. It's a volatile exit where I am often thrown into a nightmare of variable content but consistent levels of negative atmosphere. There is a point where the stairwell ends, which takes me to The Labyrinth. I cannot reliably reproduce this outcome, and have no idea what sets off the terrible nightmares. I usually avoid this door, but there's not much else to do in the Mall, and I would like to figure out what begets these bad dreams.