Wander around the vicinity of Le Boulou’s old Mairie (arguably this architecturally-underrated town’s most appealing quarter) and you’ll come across a delightful whimsy on the side of a nearby village house. The scene is of a cat on a window ledge and from a distance you’re really not quite sure. It’s not until you get nearer that you can be certain it’s a trompe l’oeil – that most charming of deceptions.