Pagan idolatry

Stand before the central altar of Scotland's legendary Rosslyn Chapel and look up. A stone face grins down at you, leaves spilling from its mouth, but something's wrong with its smile. The front left tooth is missing.

Now travel 200 miles north to Dornoch Cathedral in the Scottish Highlands. Above the west door, another carved face watches visitors with the same leafy grin. Look closer. The same tooth is missing. The exact same one.