An Imperial staircase (sometimes known as a double staircase) is the name given to a staircase with divided flights.
imperial staircase: one with a central arm breaking into 2 flights which follow the outer walls.
impluvium: (Roman) water tank housed in central hall or atrium provided with an opening in the roof.
IconostasisIn Orthodox churches, the screen that divides off the sanctuary, usually decorated with sacred images (icons).Imperial stair
A stair rising in one flight and returning at right angles in two.Impost ...
 See also: Church, Pilasters, Pilaster, Capital, Spring
  
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