Projecting your presence is a very teenage thing - the clothes, the noise, the attitude, the desire for attention. With age comes the onset of the desire to not project; to drift effortlessly through public spaces without drawing undue attention to yourself, because you're busy enough thinking about your responsibilities, you're on a schedule, and you don't need more things to deal with. Unexpected things mean delay and distraction. Conformity offers convenience, if you like.
In not projecting, you wear plain clothes without ephemeral brand names. Your phone is just a phone. The car is just a car, not a teenage tricked-out sportscar. You do not project.
And yet, modern phones and gadgets project for you. Bright glaring screens that tell the world what you're doing (which incidentally, now make cinemas unbearable. All those kids checking their glowing screens, brighter than the film you paid to see!). I've been sat next to iPhone and iPad users on planes and trains, and been exposed to their virtual worlds, in a way that's somehow more intimate that sitting next to someone with a laptop. (What is it with Angry Birds? Why is that game so popular?) How very... teenage.
I doubt I'll ever own an iPhone or iPad, as I'm reluctant to project so much in public. My phone display is as dark as possible. My work screensaver is a black screen; again, because I choose not to project or to draw attention unnecessarily. (I see the new Kindle has a passive screen that doesn't glow. That's more my style.)
I'm still projecting presence on the web and in this blog, but the audience, if any, is voluntary.