A strategy for avoiding interior monotony: chairs in contrasting and complementary colors.
Above: A suite of chairs by Piet Hein Eek in an Amsterdam apartment; photo via Dwell.
Above: Wing chairs in a starkly modern interior; photo via OWI.
Above: A trio of vintage fiberglass shell chairs.
Above: The interior of David Adjaye's Dirty House in London, via The Room Vote.