Opening tonight at Gurari Collections in Boston, “Stone from Delphi” features a series of astonishing watercolors by Wendy Artin, produced for and inspired by a collection of poems by Seamus Heaney. Artin, who currently serves as the Artistic Advisor at the American Academy in Rome, has work in museums and important private collections around the world. Heaney passed away in August after a long and celebrated career as a poet and author.