Mihrimah Sultan Mosque (Üsküdar)
The painted decor, the result of a recent restoration, was executed in a plain Classical Ottoman style, close to the original 16th century murals; they are called ‘kalem işi’ (= work of the pen/paintbrush), because they are inspired on the geometric or stylised ornamentation used by Ottoman calligraphers to illuminate books.

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Islamic Architecture: Ottoman Turkey’ (Godfrey Goodwin) – London 1977 .