The 60-30-10 rule
Color proportions: 60% base, 30% secondary, 10% accents.
The rule splits color 60% dominant base (walls, floor), 30% secondary (curtains, rug), 10% accents (pillows, art). Put the replaceable things in the 10% — swap terracotta for deep green in two years and the interior refreshes without renovation. In monochrome schemes apply it to textures instead.
See also
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