Engineering Animation, Inc. (EAI) was a services and software company based in Ames, Iowa (also known as the "Silicon Prairie"), United States. It remained headquartered there from its incorporation in 1990 until it was acquired by Unigraphics Solutions, Inc. in 1999. During its existence, EAI produced animations to support litigants in court, wrote and sold animation and visualization software, and developed a number of multimedia medical and computer game titles. Part of EAI's business now exists in a spin-off company, Demonstratives.