In the great mosque (1.9.9) there are red and white stone wedges that make up the series of repeating arches that dominate the interior. The stone wedges called Voussoirs.
A voussoir is a single unit in an arch or vault. The keystone refers to the voussoir that sits in the middle of the arch. Springers are the bottom voussoirs that are resting on the springing line. The point at which the arch begins to rise from its vertical supports is known as the springing line.
The most basic mosque would be a space designated for prayer that had a wall marked with a "mihrab" (a niche that pointed in the direction of Mecca, where Muslims are supposed to face when they pray). A minaret, a dome, and a space to wash before prayers are also common features of mosques.
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