Calligraphy is central in Tibetan culture. The script is derived from Indic scripts. As in China, the nobles of Tibet, such as the High Lamas and inhabitants of the Potala Palace, were usually capable calligraphers. Tibet has been a center of Buddhism for several centuries, and that religion places a great deal of significance on written word. This, however, does not give us a large body of secular pieces, although they do exist (but are usually related in some way to Tibetan Bhuddism). Almost all high religious writing involved calligraphy, including letters sent by His Holiness, the Oracle of the Potala Palace, and other religious, and secular, authority. Calligraphy is particularly evident on their prayer wheels, although this calligraphy was forged rather than scribed, much like Arab and Roman calligraphy is often found on buildings. Although originally done with a brush, Tibetan calligraphers now use chisel tipped pens and markers as well.