Trafalgar Square Authority in conjunction with the charity Unicef, who began ticketing the event to control crowd numbers. A Christmas ceremony has been held in the square every year since 1947. A Norway spruce (or sometimes a fir) is presented by Norway's capital city, Oslo as London's Christmas tree, a token of gratitude for Britain's support during World War II. (Besides war-time support, Norway's Prince Olav and the country's government lived in exile in London throughout the war.) The Christmas tree is decorated with lights that are switched on at a seasonal ceremony. It is usually held twelve days before Christmas Day.
Christmas tree stand The common method of illumination for these artificial Christmas trees was a floor-based "color wheel" which was placed under the tree. The color wheel featured varyingly colored segments on a clear plastic wheel, when switched on the wheel rotated and a light shone through the clear plastic casting an array of colors throughout the tree's metallic branches. Sometimes this spectacle was enhanced by a rotating Christmas tree stand. Some Christmas tree stands were uniquely designed and have value in the secondary antiques market. One example is a 1950s decorative Christmas tree stand designed by National Outfit Manufacturers Association and made