Nice one Rich,
that's a crackin panel and a lovely photo. I'm with Pebbles, it brought Dod Law to mind.
I had it in my head that right angles were not really part of the British cup and ring tradition, even Dod Law has the corners 'rounded off'. Thats another notion blown away...I guess it's a case of the more we see the less we know.
That big central cup looks just about the right size to incorporate a popomatic. Anyone for shamanic ludo?