Cao Dai priest preparing for daily worship
Incidents of Travel > Southern Vietnam > Cu Chi & Cao Dai
The gaudily and idiosyncratically decorated Cao Dai temple, dominated by a large globe whose most prominent feature is an all-seeing eye borrowed from the traditions of the Masons.

Caodaism is one of the more flamboyant manifestations of Vietnam's two centuries of adaptation to external influences. The best explanation I have found of this process, and of the American experience in Vietnam as well, is Neil Jamieson's Understanding Vietnam.