Stone Heads Appear in Yorkshire

ARG or Art? 12 Stone heads "pop up" in Yorkshire.

Each of the heads, which are up to a foot tall, looks different but all feature the same carving - which appears to spell out the word "paradox" - and a note bearing the riddle: "Twinkle twinkle like a star, does love blaze less from afar?"

Update: paradox-carving.co.uk, created by One to One Productions, looks like the "answer". Linky props to them for generating such huge publicity...