I’ve owned an iPhone now for two years, but I’m still getting my mind around it.

Not the app store, or the display, or the ubiquitous connectivity. But the way the damn thing is so aware of its surroundings.

A motion sensor tells it if it’s being jostled and which way is up. A compass tells it which way it’s pointing. GPS constantly updates its position on the map. Add the camera, microphone, proximity and ambient light sensors and – if you get a few drinks in me – the iPhone will know more about my immediate environment than I do.

It’s not hard to imagine that phone makers could start dropping in temperature, humidity and external pressure sensors, measuring your body temperature, sweatiness and grip. And once they do, you know what they’ve created?

A $200 mood ring.

Oh, you scoff now. See if you’re laughing once that information is aggregated and mapped, clusters of acute anxiety are pinpointed, and Pfizer’s aerial spraying unit responds by blanketing the area with anti-depressants.

Updated: Just when I was thinking I was so damn clever, I searched the app store.