This is a prompt for a location, although you can adapt it to an unlocated site too.
Consider your location in terms of the different layers of its inhabitation.
Layers future and past, layers culturally or personally significant, layers human and nonhuman, layers true and fictional.
Choose a subset and write, for each one of your set of layers, an account (at least one, you could write more) of what happened or will happen here. For the sake of the study, keep these accounts fairly contained, a paragraph or so.
Then, using perceptible details in that location as anchors or transition points, write a script that tells the story of this place by sliding between layers, writing and overwriting itself.
Consider all the ways that transitions can be made. Think about how one thing yields to another.
Use one or many voices/speakers.
cf all of W.G. Sebald’s work
p.s. slipstream is really a genre term for writing that slips between literary/fantasy or crosses from any other stream to another, but I like it for this tight focus too.