A collection of tangible things. Each instance of OrganicMaterial is a tangible thing composed of one or more types of organic Molecule. Instances of OrganicMaterial usually have their origin in the bodies (or other products) of living things. Since some organic substances can be synthesized, OrganicMaterial is not a subcollection of NaturalTangibleStuff. Chemically, instances of OrganicMaterial have fairly (or very) complex carbon-based structures. Examples include all instances of the collections Oil, DNAStuff, Alcohol_Compound, Ivory, and AnimalBodyPart.