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Architectural concrete columns and beams can be used structurally to form a primary frame in their own right or not. The casting orientation (horizontal and vertical cast) of the columns will be determined by a number of factors such as dimensions, visible faces, cast-in features or inserts, production restrictions etc. It should be noted that units cast vertically will have a slightly different appearance to those cast horizontally. 

Precast concrete balcony units are generally cast in their in-situ orientation to ensure the best (architectural) finish to the visible underside and edges. The top face is trowelled smooth, often to falls which allow water run of to preformed / integrated gutters and outlets. This trowelled top face can additionally have an acid-etched, grit-blasted or retarded finish. Alternatively it can be left un-treated for a site applied finish or covering. 

Spandrel panels generally span between column positions and can be either structural (transfer of floor-slab loads to the columns) or non-structural.