1920s
Furniture - choose strong streamlined shapes for furniture and in single pieces rather than suites. Look for modern classics by Le Corbusier and Eileen Gray. Reproductions and re-issues can be found.
Floor - plain polished parquet is perfect for floors. Linoleum in abstract designs or black and white chequerboard vinyl tiles are also typical.
Rug - floors would have been overlaid with a large rug in geometric patterns. Go for a huge circular one as the centrepiece to the room.
Fireplaces - fireplaces should be rectangular and bold with a stepped profile.
Colour schemes - halls suit bold colours such as silver, black, chrome, and black and white. For real dramatic impact, why not silver-leaf your entire ceiling or black-gloss your floor.
Lighting - lights featuring female figures holding the ball of the lamp are typical and good reproductions abound. Also look for chrome, a brand new material at the time, and glass. Glass would have been etched, sandblasted or enamelled rather than coloured.
Walls - keep walls plain and free from decorative plasterwork. Use a coat of varnish on top for a really glossy sheen.
Fabrics - choose shiny light-reflective fabrics or plain fabrics with metallic threads.
Accessories - add a striking painting or one statue rather than a clutter of objects. For real authenticity, look for light switches etc in Bakelite, a plastic resin. Add touches of opulence with items such as tortoiseshell and enamel cigarette boxes and mother-of-pearl letter openers.

At the time
1921 The Kid by Charlie Chaplin
1926 Television first demonstrated
1926 Rudolph Valentino dies
1927 Al Jolson in The Jazz Singer, the first talking picture
1929 Wall Street Crash