One Red Door

In China, it's tradition to paint the front door red before the new year, to invite good luck and happiness.

In Catholicism, the red door on a chapel symbolized the blood of Christ, and other martyrs, to signify that the ground beyond the door (inside the church) was holy, and a sanctuary from physical and spiritual evils.

In Ireland, front doors are painted red to ward-off ghosts and evil spirits.

In Feng Shui, the color red is the auspicious color and allows good energy in.

At my house, it signifies that we had some paint left over.