The Monstrance clock, or mirror clock, developed during the Renaissance. The monstrance was a cross-shaped gold or silver vessel which played an important part in church ritual and often incorporated sacred figures as part of the design. The clock made use of a rotating ball at the top or in the base to indicate the time of day. Monstrance clocks and crucifix clocks remained fashionable until the eighteenth century. 
- "A Review of Antique German Clocks". DiscoverClocks.com. 2012. Retrieved October 27, 2009.
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