The Clark Art Institute’s Free Sunday series continues. The April Free Sunday coincides with the Institute’s annual Artists’ Books Day celebration, honoring the library’s diverse collection of over 5000 artists’ books. Artists’ books are works of art inspired by the form or concept of a book. They can take the form of a traditional book or challenge the boundaries of what a book can be. Free Sunday: Artists’ Books Day features a full lineup of free activities as well as free admission to the galleries all day, including two special exhibitions that feature artists’ books, Raffaella della Olga: Typescripts and Sónia Almeida: Stages.