pyramid and conical shapes were invested with magical properties and power in ancient times . the soul being credited with entering the body through the skull! diversely this came through to early christianity and the pope and bishops wear such headgear, the skull cap being worn by lesser priests. the jewish "cuppel" being borrowed from the catholics! i think this also applies to muslims in iberia who also adopted the skull cap !
Five arrested in anti-terror raids in Sydney (DPA)
from the article: Spoiling for a fight