World Post Day calls for Real Red, Night of Navy, Basic White and Basic Beige.

An old-fashioned postal station contains airmail envelopes, postage stamps, mailbags, sorting trays, postcards and blue-and-red postal markings. The red and navy recall classic airmail stripes, while white and beige bring in paper, envelopes and postmarks.

Together, the colors evoke airmail red and blue, white envelopes and warm paper.

The balance of light and dark, warm and cool or quiet and energetic notes gives the combination enough contrast to stay clear while still feeling unified.