Contrail is a notional device from designer Pepin Gelardi for turning your bike into a chalk line. Some have suggested practical uses for the device. But I think leaving messages for our alien overlords is the potential “killer app.”
It’s too bad this is just a concept at this point. I would be all over that. I’d love to see what kind of trail Critical Mass would leave.
We [posted on this earlier](http://bikehugger.com/2009/03/bike-contrails.html) in the year and I wondered about chalk dust issues, like the TOC.
Bike + 3 Dogs
was the previous entry in this blog.
A Poster Party for Bike People
is the next one.
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