stacking plaster cells
The spatial realisation of the rhombus in two layers can be constructes as one element. Such plastee elements are stacked to construct the muqarnas.
In his publication An introduction of Muqarnas Domes Geometry Mamoun Sakkal shows on a rawing how you can vary on the rhombus with curved or straight sides, devided or not.
on the first row you recognise the biped below - almond above and almond below - biped below as variations of the same type of element.
On the website of the School of Islamic Geometric Design you can find pictures and some video's on the construction an stacking of the cells.
