In 1953, almost a quarter century after arriving in this country from Greece, the artist and horticulturalist Nassos Daphnis came to Provincetown. Among the artists he met was Helen Avlonitis, a student of Robert Motherwell. They were wed in 1956 and bought this house, then roughly a century old, in 1958. A year later, the gallerist Leo Castelli in New York gave Daphnis a one-man show that “established him as a leading exponent of geometric abstraction,” The New York Times said in his 2010 obituary. Besides painting, Helen Daphnis-Avlon operated the Avlon Sun Gallery in the 1980s. She died in 2004.