Fourteen years ago, the artist Dorothea Tanning published Birthday, a collection of reminiscences. Now she has expanded it into a memoir of her journey through the last century as confidant, collaborator, and muse to some of its most inspired minds and personalities: a diverse assemblage that ranges from the fathers of dada and surrealism to Virgil Thompson, George Balanchine, Alberto Giacometti, Dylan Thomas, Truman Capote, Joan Mir?, James Merrill,...