Sedan, Kansas is a prairie town that not long ago looked like it was dying. But the town has reinvented itself as an art colony. “As word spreads, artists have begun arriving. Some are refugees from what they say are overcommercialized art scenes in places like Santa Fe, N.M. One, Stan Herd, a pioneer of environmental art, has built a monumental stone work called “Prairiehenge” on a hilltop outside town.”