A fixture, as a legal concept, means any physical property that is permanently attached (fixed) to real property (usually land). Property not affixed to real property is considered chattel property. Fixtures are treated as a part of real property, particularly in the case of a security interest. A classic example of a fixture is a building, which, in the absence of language to the contrary in a contract of sale, is considered part of the land itself and not a separate piece of property. Generally speaking, the test for deciding whether an article is a fixture or a chattel turns on the purpose of attachment. If the purpose was to enhance the land, the article is likely a fixture; if the article was affixed to enhance the use of the chattel itself, the article is likely a chattel. Chattel property is converted into a fixture by the process of attachment. For example, if a piece of lumber sits in a lumber yard, it is a chattel. If the same lumber is used to build a fence on the land, it becomes a fixture to that real property. In many cases, the determination of whether property is a fixture or a chattel turns on the degree to which the property is attached to the land. For example, this problem arises in the case of a trailer home. In this case, the characterization of the home as chattel or realty will depend on how permanently it is attached, such as whether the trailer has a foundation. The characterization of property as a fixture or as chattel is important. In most jurisdictions, the law respecting the registration of security against debt, or proof that money has been lent on the collateral of property, is different for chattels than it is for real property. For example, in the province of Ontario, Canada, mortgages against real property must be registered in the county or region's land titles office. However, mortgages against chattels must be registered in the province-wide registry set up under the Personal Property Security Act. In the case of a trailer home, whether it is a fixture or chattel has a bearing on whether a real property mortgage applies to the trailer. For example, most mortgages contain a clause that forbids the borrower from removing or demolishing fixtures on the property, which would lower the value of the security. However, there have been