Three basic ways to inject random or not-so-random variations into text.

"M. Melmoth's Duel"
Saint-Germain-des-Prés is a room. "Haunt of artists, of the coffee-drinking sort, and of cafés, of the artist-haunted sort, you once again find yourself outside M. Melmoth's hotel. Today [one of]the recently-fallen rain runs down the gutters of the 6th[or]sunlight glints even off the blackened windows of the Abbey[or]crowds of vulgar children play chase around the lampposts[at random], and you long to be indoors."
The Hôtel d'Alsace is inside from Saint-Germain-des-Prés. "Typical. Oscar writes you a letter announcing his own imminent demise - 'My wallpaper and I are fighting a duel to the death. One or other of us has got to go.' - and then you get there and he's out, no doubt procuring paint the colour of absinthe, if he isn't procuring the painter."
Tint is a kind of value. The tints are green, aquamarine and darkish purple.
The wallpaper is fixed in place in the Hôtel. The wallpaper has a tint. "In this light, the wallpaper has a distinctly [tint of the wallpaper] wash. [if the tint of the wallpaper is darkish purple]You particularly dislike purple.[end if]"
Before going to the Hôtel: now the wallpaper is a random tint.
After going from the Hôtel, say "You leave, shaking your head. But within twenty-four hours, you are back, as you always knew you would be."
Test me with "in / out / look / in / out / look".
Test me with "in / out / look / in / out / look".
Saint-Germain-des-Prés
Haunt of artists, of the coffee-drinking sort, and of cafés, of the artist-haunted sort, you once again find yourself outside M. Melmoth's hotel. Today the recently-fallen rain runs down the gutters of the 6th, and you long to be indoors.

>(Testing.)

>[1] in

Hôtel d'Alsace
Typical. Oscar writes you a letter announcing his own imminent demise - "My wallpaper and I are fighting a duel to the death. One or other of us has got to go." - and then you get there and he's out, no doubt procuring paint the colour of absinthe, if he isn't procuring the painter.

In this light, the wallpaper has a distinctly green wash.

>[2] out
You leave, shaking your head. But within twenty-four hours, you are back, as you always knew you would be.

>[3] look
Saint-Germain-des-Prés
Haunt of artists, of the coffee-drinking sort, and of cafés, of the artist-haunted sort, you once again find yourself outside M. Melmoth's hotel. Today sunlight glints even off the blackened windows of the Abbey, and you long to be indoors.

>[4] in

Hôtel d'Alsace
Typical. Oscar writes you a letter announcing his own imminent demise - "My wallpaper and I are fighting a duel to the death. One or other of us has got to go." - and then you get there and he's out, no doubt procuring paint the colour of absinthe, if he isn't procuring the painter.

In this light, the wallpaper has a distinctly aquamarine wash.

>[5] out
You leave, shaking your head. But within twenty-four hours, you are back, as you always knew you would be.

>[6] look
Saint-Germain-des-Prés
Haunt of artists, of the coffee-drinking sort, and of cafés, of the artist-haunted sort, you once again find yourself outside M. Melmoth's hotel. Today crowds of vulgar children play chase around the lampposts, and you long to be indoors.