Eidos

Eidos is a term originating from ancient Greek philosophy that refers to the ideal, perfect form or essence of something—its fundamental nature or blueprint. Think of it as the perfect concept or pattern that real-world instances emulate but may never fully embody. For example, the Eidos of a chair is the ideal form of a chair, encompassing the perfect qualities that make something recognizable as a chair. In modern contexts, it can also relate to the underlying vision or ideal of a project or concept that guides its development.