Nature is art
The work of Jackson Pollack? Paul Klee? Mark Rothko? No, it's an abstract produced by one Mother Nature, using the medium of lichen. Stunning, isn't it? If you want to see more artwork like this, don't bother going to your local gallery, but visit a churchyard or stone wall near you. The show is open all year round and entry is free!
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Having said that, I rather enjoyed a few paid exhibits in London's museums/galleries recently and the best was Sherlock Holmes at the London Museum as well as Gothic at the British Library.