The culture of Turkey is rich in art, architecture, and music. Turkish art is defined by calligraphy during the Ottoman Empire and intricate marbled paper techniques. Architecture evolved from early mosques designed by the Seljuk to incorporate courtyards and fountains under the Ottomans. Today buildings are becoming more modern. Turkey's diverse musical traditions are reflected in regional dances like the standing shoulder-to-shoulder Bar dance, group Halay dance featuring unique instruments, fast-paced Horon folk dance of the Black Sea region, and tempo-changing Zeybek dance typically accompanied by drums.