A visitor takes photos of a work by artist Chang Dai-chien (Zhang Daqian) during the commemorative exhibition "Silhouette of a Great Master: A Retrospective of Chang Dai-chien's Art on the 120th Anniversary of His Birth" at the Palace Museum in Taipei, southeast China's Taiwan, April 1, 2019. Opening here on Monday, the exhibition shows 87 pieces of Chang Dai-chien's artworks along with more than 80 seals he has ever used. (Xinhua/Zhang Guojun)