"There is something haunting in the light of the moon; it has all the dis-passionateness of a disembodied soul, and something of its inconceivable mystery." Joseph Conrad (1857-1924), Polish author who wrote in English, after settling in England.
Trick-or-treating evolved from the ancient Celtic tradition of putting out treats and food to placate spirits who roamed the streets at Samhain, a sacred festival that marked the end of the Celtic calendar year.
During the pre-Halloween celebration of Samhain, bonfires were lit to ensure the sun would return after the long, hard winter. Often Druid priests would throw the bones of cattle into the flames and, hence, "bone fire" became "bonfire."
Dressing up as ghouls and other spooks originated from the ancient Celtic tradition of townspeople disguising themselves as demons and spirits. The Celts believed that disguising themselves this way would allow them to escape the notice of the real spirits wandering the streets during Samhain.
Halloween was influenced by the ancient Roman festival Pomona, which celebrated the harvest goddess of the same name. Many Halloween customs and games that feature apples (such as bobbing for apples) and nuts date from this time. In fact, in the past, Halloween has been called San-Apple Night and Nutcrack Night.
Black and orange are typically associated with Halloween. Orange is a symbol of strength and endurance and, along with brown and gold, stands for the harvest and autumn. Black is typically a symbol of death and darkness and acts as a reminder that Halloween once was a festival that marked the boundaries between life and death.
Have a Blessed Day! Watch out for the Ghoulies and Goblins!