After Impressionism came a harder-to-define, less accessible movement: Symbolism. Emerging in 1880s France, its artists were cynics who disdained the Industrial Revolution and feared a broad moral decline. They embraced diverging styles, looking not to the shimmering lake before them but to the past, the future, and the interior self. Symbolism was a reaction against rationalism, materialism, and the external world. “Symbolism is the language of the mysteries,” wrote Manly Hall. Now these mysteries come together in an exhibition featuring works by artists from Edvard Munch to Léon Spilliaert. Eighty-five paintings, beautiful and strange, are on view. —Elena Clavarino