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."
Sky Writing for Your Bike
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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 in the year and I wondered about chalk dust issues, like the TOC.