As the season turns, we cling to the summer we have left in various ways, be it soaking up the washed-out hues of a retirement community pool or gawking at the celestial rendering of a greasy-haired Californian (we presume) eating cherries from a rusty pot. Caroline Burghardt's dirty-elbowed hippie is swathed in heavenly light: Is she Jesus's secret girlfriend? Joni Mitchell? See her at Luhring Augustine through Friday.