There is an art to art collecting that involves quite different skills from those employed by artists. People tend to assume it's all about rich people spending money, but, if that was all that was involved, collecting wouldn't have half the attraction it does for those obsessed by it.
Collecting involves much more than mere money, as demonstrated by the story of Dr. David Khalili, part of whose collection has been given a kind of joint academic-treatise/coffee-table-book treatment with the publication of "Japonisme and the Rise of the Modern Art Movement: The Arts of the Meiji Period."
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