Buildings have, historically, provided us with a record of man's achievements and beliefs and nowhere are his superstitions more vividly illustrated than in the dwellings in which he lives, works and worships. In the United States, a tree, broom or flag is generally hoisted to the top of the framework as a symbol of good luck. The flag is a patriotic gesture. The tree is a symbolic throwback to the days when most of our buildings were made of logs. The origin of the broom is more difficult of place, but it has been attributed to the belief in witchcraft prevalent among early colonists. Italians have an old world custom which prevails today. When a new apartment or house is ready for occupancy, the tenants will throw salt in one corner in every room. This is supposed to protect the family from disease. Days of the week are another basis for many superstitions. Italians do not like to move on Friday; they feel that this invites trouble and that they will never be happy in their new home or apartment. American contractors are also cautious about days of the week. Some will not begin construction of a new project on Friday. There are many practical reasons for this, among them payrolls, but it is also felt by some that any project begun on Friday will be plagued by accidents.