You probably think this post is about you

A colleague had a prominent vein in his forehead that I always thought looked like the River Thames. This vein had a u-shaped bit that especially recalled the Isle of Dogs (like in the EastEnders credits), then it widened out into a kind of estuary. But now I’ve noticed the shape of the vein is changing. I’m wondering if it’s going to become another river. I dare not consult the Geography department about this but I’ll keep watching and see what emerges.