Calligraphy Masters of the ECO region have had the greatest impact on the promotion of calligraphy. Among their lasting artworks is the sacred verse of "Bismillah", written in different styles. "Ganj Nameh" (Treasury Epistle), is a collection of selected artworks submitted to the "Bismillah" festival, published by the ECO Cultural Institute in cooperation with the Center for promotion of Quranic Arts.