I have a friend who is a film editor. When you go to the movies with him, he doesn’t watch the film but its composition. While you’re enjoying the acting, the plot and the dialogue, he will talk to you with a precise passion about a sequence of jump cuts that barely registered with you. He sees things that you don’t. Similarly, perfumers smell things that you don’t. One whiff and they are deconstructing a perfume and staring down its interior architecture.

I once commented to L’Artisan Parfumeur’s creative director, Pamela Roberts, on the surprising (my word) commercial success of Jennifer Lopez’s first scent. “It’s not at all surprising,” she replied. “It’s an ingenious perfume.” Ingenious? Because it smells like make-up, she explained. And it does. Louise Turner’s scent reinforces everything associated with makeup: luxury, status, beauty, reassurance, love. The concept may have come from Lopez or from Coty’s Catherine Walsh, who oversees J.Lo’s hugely successful perfume franchise, but the technical work is Turner’s, and it is rock solid. Glow subtly triggers the right synaptic responses. The parts meld. Its engineering is velvet.