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A specialization of InanimateObject. Each instance of Artifact is an at least partially tangible thing which was intentionally created by an Agent_PartiallyTangible (or a group of Agent_PartiallyTangibles working together) to serve some purpose or perform some function. In order to create an instance of Artifact, it is not necessary that an Agent_PartiallyTangible create the matter out of which the Artifact is composed; rather, an Agent_PartiallyTangible can create an instance of Artifact by assembling or modifying existing matter. Examples of Artifacts include a wooden flute that's been whittled from a tree branch, a sawhorse that's been put together out of boards and nails, and a coin that's been minted by embossing or by melting liquid silver into a mold. In addition to the obvious human artifacts (buildings, tools, textiles, power lines), the collection Artifact also includes certain sorts of things made by Animals, such as bird nests, termite mounds, and beaver dams. Artifacts without any tangible parts are excluded from the collection Artifact; they are included in the collection Artifact_Intangible.