Photo: Roger Davies

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Mistake #5: Sticking to One Theme, Full-Throttle
"When people follow one trend and take it all the way to the hilt, it feels like an overdose. Whether it's English or French country or ultramodern, too much of one thing can feel like you've stepped back in time—or worse, into a furniture showroom."—Phoebe Howard

Left: This entrance hall incorporates an Italian daybed, a Dutch mirror, a Persian rug and a Venetian chandelier, all from different time periods.

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