The premise is simple. As I say on my twitter profile, I consider myself to be a 1974 vintage London native who is yet to mature. That is to say that I've retained a juvenile sense of humour (aided and abetted by a Viz subscription). So when, the other week, my mate Nige set me a challenge for a walk to spell out a word, I took that ball and ran with it. And turned it into two balls and a shaft. I decided to scribble a virtual cock on the landscape.
The Cerne Abbas Giant may have got there way before me, and this guy may have been drawing things with GPS trails for years (and taking it all very seriously), but as far as I can tell I am a pioneer in the fledgling scribbling-genitals-with-technology-like-a-schoolkid-on-an-exercise-book space. I'm also giggling a lot.