 
 <prompt> Wetin be di main purpose of di religious place wey dem build di religious mosaics and secular ceiling mosaics? Based on di previous question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: For Rome, Nero and im architects use mosaics cover some parts of walls and ceilings for Domus Aurea wey dem build for 64 AD, and wall mosaics dey also for Pompeii and oda places wey dey near. But e be like say na for Christian era na im figural wall mosaics come be major form of artistic expression. The Roman church of Santa Costanza, wey serve as mausoleum for one or more of the Imperial family, get both religious mosaic and decorative secular ceiling mosaics for round vault, wey fit be style of contemporary palace decoration. 