This pencil drawing shows one of the mullioned lateral windows in the qibla wall of the mausoleum of the Sultan Hasan Mosque in Cairo. An Arabic inscription separates the two lower rectangles from the lunette. Their pattern of flowers and circles is framed by borders.
Pascal Coste drew only little more than half of the window and made annotations for the colours.

Between 1818 and 1827, Pascal Coste documented the buildings in Cairo extensively, among them the Sultan Hasan Mosque (757–764 AH / 1356–1363 CE). Two preparatory works for his publication Architecture arabe, ou Monuments du Kaire, Mesurés et Dessinés, de 1818 à 1826 (1837) are dedicated to the windows of this mausoleum (see IG_202). The present one shows the pointed mullioned window and has indications for the colours of the pieces of glass: white (blank), green, yellow, and red. A second drawing shows the circular window of the qibla wall (IG_295).
Another preparatory work, a watercolour (Victoria and Albert Museum, SD.272:14, IG_130), shows the wall lightly coloured. This colouring corresponds only approximately to the colour indications of the present drawing. So, for instance, the blank round pieces of glass indicated appear in a reddish colour.
The windows of the mausoleum of the Sultan Hasan Mosque were remade on the model of the old ones in 1906 (see Related Location).