Calligraphy in architecture

Geometric Kufic script. 

Calligraphy is a common decorative element in Islamic architecture.  I have noticed beautiful script on buildings throughout the Fez Medina, and was inspired to make this drawing after a recent discovery. 

Kufic script is the oldest type of Arabic calligraphy, and was named after the city of Kufa, in Iraq.  It was in this script that the oldest copies of the Qur'an were written.
The phrase written here is:  لا حول ولا قوة أو قوة إلا بالله الرحيم'  There is no power or strength except with Allah.'   The Shahada or the Islamic creed is also a common phrase written on the exterior of mosques, أشهد أن لا إله إلا الله و أشهد أن محمد رسول الله  There is no god but Allah, and Muhammad is his messenger.