ABSTRACT
All viable designs of human intelligence have natural analogs. In the fourth century B.C., Aristotle, learning from nature, identified the necessary ingredients in the life cycle of a successful structure as material, plan, execution, and service. Suspension bridges stretch all of these ingredients to their allowable limits. Appropriately, they were to take firm hold among the greatest structural achievements several millennia after their monumental predecessors made of timber, stone, and other naturally found materials.
