Mind Meld: Writing in Another Author's Universe

For anyone who missed it, I participated in a Mind Meld at SFSignal with a number of other writers and editors, which was published on May 27. Here it is:
http://www.sfsignal.com/archives/2015/05/mind-meld-writing-another-authors-universe/

The question posed:
"Recently, Alastair Reynolds and Stephen Baxter announced that they were writing a story set in the Jupiter-diving “Medusa” world of the late Arthur C Clarke. Collections such as Songs of the Dying Earth feature writers trying their hand in Vance’s many universes.

With that in mind…
What fallow universe do you think deserves additional exploration, and who would you ask to write in that world?"

Follow the link and scroll down to see my reply.

(This item was published belatedly but scheduled as if on May 28, a day after the Mind Meld was posted, to keep it tidy in the blog timeline.)