Meanings of companion pieces in English

Its companion pieces were done with equal strength and insight.

The writer, when residing in Lowell, in 1843 contributed this and the companion pieces to 'The Stranger' in Lowell.

For pictures there were early art-chromos, among them the once-prized companion pieces, "Wide Awake" and "Fast Asleep."

The Scherzo of Op 12 prefigures much from the chilling pantomime, and the two works function well as companion pieces.

Are they companion pieces?

Haneke is deliberately cold and intellectual in his approach, imbuing his companion pieces with a provocative meta-playfulness that made them shocking and also uncomfortably ambiguous.

" Companion pieces, my life's saving angels-beholdyourself, my Emily, see my fairy mother," and sure enough there we were.