I've discovered that it only takes thirty minutes to walk from home to work, so I've been getting extra exercise walking to and from most days. And also I've discovered the oevre of someone I like to call "the penis artist" for obvious reasons (see below.) I've only found three extant works so far, but there is a distinctive look to all three that makes it clear this is the work of a single individual of the geo-primitive school.
Then again, the artist might be part of the penisart.org school.
Of course portraying erect penii is an old human tradition, found in both ancient Greek vases...
And even carved into hills, as with the "rude man" known as the Cerne Abbas Giant.
...which you can see using Google Maps.