some more stuff that came up to my mind on my way home.

The mid-world is actually a huge theme park, with catacombs (down) and a 'cosmic map' (up). Catacombs are inhabited by ghosts and constellations are inhabited by angels. Angels are organized in 'gangs', according to the constellation that they belong to, and love to play jokes on people. Ghosts instead have Unions to help represent their rights in dealing with living people.

The theme park is called 'DreamLand' (maybe). The interesting thing about DreamLand is that inside there, somewhere, there is the real world of which DreamLand is a mockup. If you find it you will live forever (if you really want to ...). Shopping is forbidden in DreamLand. If you are caught shopping by a policeman you will go to jail. Only free exchange or donation (of creatures) is alowed.

Users can eventually join Angel gangs or Ghost Unions.

(digression: watching 'Brazil' and seeing 'The City of Lost Children' for those who haven't seen them becomes a must. I personally would like to re-visit 'Blade-Runner'. Dunno exactly why. Missing some techno stuff here I guess. There must be a solitary hero here somewhere in here making justice of some unjust dream ...)

Nightmare Burgers are everywhere like StarBucks - people go there to drink, rest and dream-chat.

There are dream-poets that write beautiful (visual) dream-poems. People can get them and send them to other people. That is the start for being able to dream together.

The worst illness that you can get in DreamLand is insomnia because that won't allow you to dream. There are doctors for that. You need to find them if you want to be able to continue playing ... If you can't find a doctor you can always consult the oracle (the one we talked about, half human-half pager).

Time in DreamLand does not exist. Time is only in the hands of the grey people (because they have clocks like the white rabbit). Actually whenever a Reality Bomb hits DreamLand it starts a local clock and then things start growing older and older and then die and fall into the catacombs. The ghost Unions need to make pressure on the living people so that they do not forget the dead. So sometimes they organize demonstrations or happenings to honor this or this other ghost.
So, in DreamLand past and present and future are all mixed together (can you help me think about the consequences of that ?).

And near and far are measured only by the similarity of dreams.

Users who cannot make their own dream (visually on the web) can write to a dream factory who will create the dream that they ask for. They can keep the dream for personal use and they can also find a co-dreamer to start dreaming together. This should work as a chain so that it gets more and more people involved.
To enter the game/story you have to find a co-dreamer.
To find a co-dreamer people can go to this place in the theme park where there are gigantic machines. These machines are:
a huge crossbow, a windmill that rotates faster and faster until it launches a dream, a huge cannon (gun) that uses whipped cream as a starter and a fat woman as a carrier, a bow, a used rocket launcher + other machines that you can help me think of. They put the dream in there and then the dream will be launched into somebody's web page.

Note: it is important to use fax and cell phones or even regular phones (with prerecorded messages) to make people even more involved.

And there are of course dream thieves (users can choose to be one).

There could be a perfectly simmetric mirror to this world called RealityLand where people can only talk about reality and where dreaming is forbidden. (a different notion of a mirror site ... an inverse mirror site!). People can use only text to communicate. Their world is full of administrative buildings and there are clocks everywhere. This world is full of replicated rabbits and here Alice runs a black market of dreams.

There are holes both in DreamLand and RealityLand that all of a sudden can bring you from one place to the other. In between the two worlds you could get caught into this Limbo which is made by those dreams who had never had the chance to become true. The forgotten dreams. The dreams of those who gave up. The dreams of thise who passed away. Some people who stop by this intermediate world can pick them up and make them live again in DreamLand...