After the decidedly over-ornate excesses of "art nouveau" came a paring-down of superfluous decorative features and then
an almost total banning of ornamentation by architects such as Le Corbusier and Mallet-Stevens. Willowy patterns gave way to sharp outlines.
Nonetheless, the effect can be stunning.
Not all Parisian architects were as radical in their thinking and still made use of artfully composed wrought-iron.
Others favoured stained glass.
Or to highlighting entrances by adding sculpture or awnings to enliven otherwise rather plain doorways.