Witchcraft, in various historical, anthropological, religious and mythological contexts, is the use of certain kinds of supernatural or magical powers. Witchcraft can refer to the use of such powers in order to inflict harm or damage upon members of a community or their property. Other uses of the term distinguish between bad witchcraft and good witchcraft, the latter involving the use of these powers to heal someone from bad witchcraft. The concept of witchcraft is normally treated as a cultural ideology, a means of explaining human misfortune by blaming it either on a supernatural entity or a known person in the community. A witch (from Old English wicce f. / wicca m., also compare hag) is a practitioner of witchcraft. Halloween (also spelled Hallowe’en) is a holiday celebrated on October 31. It has roots in the Celtic festival of Samhain and the Christian holy day of All Saints’ Day. It is largely a secular celebration, but some Christians and pagans have expressed strong feelings about its religious overtones. Irish immigrants carried versions of the tradition to North America during Ireland's Great Famine of 1846. The day is often associated with the colours orange and black, and is strongly associated with symbols such as the jack-o'-lantern. Halloween activities include trick-or-treating, wearing costumes, ghost tours, bonfires, costume parties, visiting haunted attractions, carving jack-o'-lanterns, reading scary stories, and watching horror movies Brooms have long been connected with witchcraft, almost universally portrayed as mediaeval-style round brooms and associated with female witches. Despite the association with women, in 1453, the first known case of claiming to have flown on a broomstick is recorded, confessed by the male witch Guillaume Edelin. There are, however, prior records of witches flying on sticks or similar objects, usually that had been first greased with a magical flying ointment. Anecdotally, the broom served another purpose during periods of persecution. Witches and other magic practitioners would disguise their wands as broom sticks to avoid suspicion. It is also a tradition that brooms have been used by some as receptacles to harbour temporarily a particular spirit. Today the broom is included in lists of ritual tools in many pagan guide books, where it is often referred to as a besom. A broom is sometimes laid at the opening of some covens' rossets. Representing the Element of Air, brooms are utilised in the purification of areas. They are used to sweep ritual circles clean of negative energy. The high priestess or high priest walks clockwise, traces the cast circle and sweeps with the broom a few inches off the ground. This practice can be used in addition to or in place of incense to purify a ritual space. It is often employed by those allergic to incense, and during rituals practiced in smoke-free areas. It is also a technique associated with "kitchen witches" who use what's on hand to work spells. As a tool of purification, decorative brooms are sometimes hung near doors to cleanse those entering a house.