If you’re a writer (or want to be one), I strongly recommend reading the article itself. But let me highlight the concept of IWATH, short for “I was there.” An IWATH moment in a piece of writing is something that makes the reader believe that the writer/narrator had to have been there when the action took place. It makes a scene seem absolutely real.
In my mind, IWATH means a detail so distinctive that it doesn’t seem like something generic that a writer might just toss in without thinking. For example, imagine a suburban backyard. There are lots of “standard” things you immediately think of: a patio, a barbecue, a swing-set, a vegetable garden, and so on. Some backyards may not have all of these things, but the features are common enough in backyards (at least in North America) that in a piece of fiction, they won’t attract much attention.
In other words, such details aren’t memorable. They’re what you’d expect. They don’t make you feel as if the writer is describing a specific backyard at a specific time. They give you a backyard that’s vague and generalized: one that doesn’t feel truly real.
An IWATH detail stands out as something that isn’t the same-old same-old. It needn’t be aggressively weird, just non-generalized. For example, the teenagers of the house may have placards laid on the lawn and they’re painting protest signs because they’re going to picket their school the next day. At the moment, they’re debating the pros and cons of putting an asterisk in place of the U in FUCK.
Suddenly, the scene is specific: not just any backyard, but a backyard belonging to a specific family whose members do specific things, and this is a specific time on a specific day. Whatever happens in the yard may have nothing to do with the protest at all—the business with the signs may just be a background detail. But it’s a non-generic detail. It seems like a real thing, so it makes the rest of the scene seem real too.
My first writing teacher, W. O. Mitchell, called these impertinences: details that make a scene feel real because they aren’t what a writer would just trot out when writing on autopilot. The tor.com article says that Mitchell tries to put three IWATH moments into every scene. If you’re a developing writer, that’s a great goal to aim for.
[Picture of clouds from flagstaffotos.com.au [GFDL 1.2], from Wikimedia Commons]