I work in visual effects (for film) as my day job, so I think that visual storytelling is always a big part of my writing. Narrating is kind of a cheat, in both worlds. It’s cheating to tell a reader what to think, and it’s bossy and flimsy and a lot can go wrong. Better to give them something physical to react to and trust that they’ll arrive at whatever you’re getting at by themselves.

I live in a lovely part of the countryside, and scattered around where I live (South Wales) there are at least half a dozen pillboxes. These are buildings that were built in WWII—designed as heavily fortified machine gun emplacements—and they formed defensive lines across southern and eastern Britain in case of a German invasion. They weren’t designed to stop the enemy advance, just slow it down. They were always built in line of sight of the next pillbox, and though many have now vanished, there are still lots of these overgrown, solid buildings, usually made of cast concrete and brick. They’ve always interested me.

In the 1970s, to research a novel called Testament, I spent thirty-five days on a survival course in the Wind River Mountains of Wyoming. If anyone’s curious, the course was conducted by Paul Petzoldt’s National Outdoor Leadership School and trained its students in a variety of mountaineering skills. At the time, I lived in Iowa City, where I was a literature professor at the University of Iowa. After I descended from the mountains, I drove back home along Interstate 80, but my car developed engine trouble, and in the Nebraska panhandle, I had to leave the highway, hoping to find a mechanic. That’s when I came to this very unusual, very scary town.

A lot of things went into this story, but the main thing was reading a news article about transgender teens using online games to explore gender identity. At the time, I’d recently written a story in which a man takes on a female identity online for practical purposes so he could post things he perceived as “girly” without attracting attention. But it hadn’t occurred to me that an online gender swap could be such a powerful tool of self-discovery. So I wanted to explore that.