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I love watching contrails, those streams of white frozen exhaust that jets leave behind. It's a temporary track in the sand, and then the sun melts them and they're gone.

Go to Montana and you might see the tracks dinosaurs left a bazillion years ago. Same sort of travel, very different half-life of their passage.

All day long you're emailing or tweeting or liking or meeting… and every once in a while, something tangible is produced. But is there a mark of your passage? Fifty years later, we might hear a demo tape or an outtake of something a musician scratched together while making an album. Often, though, there's no trace.

I'm fascinated by blogs like this one, which are basically public notes and coffee breaks by a brilliant designer in between her 'real' work. Unlike tweets, which vanish, Tina's posts are here for a long time and much easier to share and bookmark. Her trail becomes useful not just to her, but to everyone who is interested.

What would happen if you took ten minutes of coffeebreak downtime every day and produced an online artifact instead? What if your collected thoughts about your industry became an ebook or a series of useful instructions or pages or videos?

What if we all did that?