Guess who the luckiest art collectors of the past ten years have been. The Irish-and their luck has consisted of one thing only: They've bought paintings done by their Irish ancestors. Had you managed to catch an elusive leprechaun in 1990, he might have handed over "The Proud Galloper," a breezy Sligo painting of a wild horse and a stable boy done in 1945 by Jack Butler Yeats, the famous poet's unsung brother. It sold at Christie's in 1998 for $1.4 million-eight times its estimate.
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