In a pleasing departure from the usual holiday frou-frou, The Betts House is showing small, uncluttered, abstracted house portraits by Marcia Alscher, who understands the geometry of buildings in a visceral way. The Betts House, built in 1804 and now the oldest brick house in Ohio, is itself small and uncluttered. Alscher's paintings are perfectly at home in its rooms. Regular hours (11 a.m.-2 p.m. Tuesday-Thursday) are extended to 12:30-5 p.m. on Saturdays through Dec. 18, with family-friendly craft activities and seasonal refreshments.