Synagogue architecture often follows styles in vogue at the place and time of construction. There is no set blueprint for synagogues and the architectural shapes and interior designs of synagogues vary greatly. According to tradition, the Divine Presence (Shekhinah) can be found wherever there is a minyan, a quorum, of ten. A synagogue always contains an ark, called aron ha-kodesh by Ashkenazim and hekhal by Sephardim, where the Torah scrolls are kept.