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The artwork was not invisible - no one had noticed it. No cave art had been discovered in Britain before, so it seems that no one had bothered to look.
Having said that, someone must have seen it, as one animal has had a beard added to it in recent times, with other nearby graffiti saying "P.M. 1940".
The article describes the cave art as "paintings". They are not paintings, they are engravings.
I took the opportunity to go and have a look and am still in wonderment as to what I have seen. The rock art specialists were in the caves during my visit and found even more engravings while I was there!
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Something is not right. This message is just to keep things from messing up down the road