String your Christmas tree lights VERTICALLY! Decorators at New York City’s Rockefeller Center (and who would know better how to light a tree?) use a trunk-to-tip method to create “not just a shell of light but an inner glow and a three-dimensionality that cannot be achieved any other way,” says David Murbach, the manager of the center’s gardens division.
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The Art of Christmas Tree Lighting | Real Simple
How to Decorate a Christmas Tree