А religious visual arts heritage includes frescoes, murals and icons, many produced by the medieval Tarnovo Artistic School. Like literature, it was not until the National Revival when Bulgarian visual arts began to reemerge. Zahari Zograf was a pioneer of the visual arts in the pre-Liberation era. After the Liberation, Ivan Mrkvička, Anton Mitov, Vladimir Dimitrov, Tsanko Lavrenov and Zlatyu Boyadzhiev introduced newer styles and substance, depicting scenery from Bulgarian villages, old towns and historical subjects. Christo is the most famous Bulgarian artist of the 21st century, known for his outdoor installations.