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For most people, visiting a museum (especially when overseas) is a tourist experience; for me, it's usually work, but that doesn't mean I don't enjoy it. Research trips are fun but they are still research. So if Google Art is for the most part about giving people the chance to be 'virtual tourists', then I don't see why it doesn't give me the same chance to be a 'virtual researcher'.
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Another thing I was particularly excited about was not just 'visiting' galleries I'd never been to, but seeing old favourites in new ways... that is, in ways not possible when you're standing in the room. I've been doing some work on François Lemoyne recently, so when I first had a play with Google Art I went straight to Versailles to hunt out the Apotheosis of Hercules that he painted on the ceiling of the Hercules Salon. I've spent many hours standing in that room being jostled by hundreds of tourists, straining my neck and nearly falling over backwards to try and see Lemoyne's painting. And forget photographing it, that's always a complete blurry and piecemeal disaster.
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With the Versailles example, once again I can see how it's going to become a really useful teaching and presentation tool. I can take a screen shot of the room and the floor plan, showing exactly where in the palace the painting is so I can show students and others who haven't had the chance to see it in situ for themselves. How great will that be for teaching museum studies and curating courses, giving students a virtual experience of the space and the context of its location in the museum all at once? Of course, in this respect, one of the pros is also one of the cons... it may be an art historian's relief to see the Mona Lisa without crowds of tourists, but it's certainly not an authentic experience of the object from a museological perspective.
Google Art is not flawless and it's not free of issues... but for the art historian, it's fun, useful and exciting. And that's enough for me.