Let's Get Physical?

Projects that translate digital content into something physical (combining the ease of the former with the tangibility of the latter) are all the rage in the marketing world. They speak to some basic human needs for tactility and possession and are a reaction to the increasing virtuality of many people's lives.

While I love the whole idea of this Nike project and its modernisation of the age-old tradition of chalking messages on the Tour de France road, I'm not sure it is physical enough. If yours is one of the 100,000 messages, what is the likelihood of your seeing it? The race is, after all, nearly 2000 miles and three weeks long.

Obviously, a lot of these issues will have been addressed but, in the context of such a huge "tarmac "billboard", is it personal enough? Or is it simply physical?