Marks - Ogham on a spinning whorl.
When on Orkney Fiona and I visited St Magnus's cathedral. Whilst impressed with the size and architecture of the building what also caught our eyes were the registered marks that the stone masons had carved into a couple of the columns to register the fact that they had carried out the stone work. A few of the makers' marks .....
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But of course over the centuries vandals need to leave their marks - as you can see these were happening in 1771 and earlier in St David's cathedral in Wales.
Funny how we excuse some vandals such as the person who wrote in Ogham on a windowsill in a church in Nevern in Wales.
