“In my own researches and findings,” the artist Ossip Zadkine wrote in 1944, “I have always insisted on plastic and sculptural values, and also on what I call a poetic climate.” Poetic climate is much in abundance at the Musée Zadkine, where the exhibition “The Dreamer of the Forest,” its title taken from a 1946 sculpture by Zadkine, explores the sentience of the forest, and its primal power as a creative force in art. —L.J.