Rich is a Python library for rendering rich text, beautiful formatting, and advanced content to the terminal. It provides a Console class as its central abstraction, which manages terminal capabilities (color systems, width, encoding) and renders a composable hierarchy of 'renderables' — objects implementing the __rich_console__ protocol that yield Segment tuples (text, style, control codes). The architecture is a monolithic library with clean internal modularity: the Console orchestrates rendering, Segment is the low-level output primitive, and higher-level renderables (Table, Tree, Markdown, Syntax, Progress, Layout, Live) compose into each other via the protocol. Key entry points are the module-level print/inspect/print_json functions (backed by a global Console singleton), the Console class for explicit control, and CLI modules (python -m rich.syntax, python -m rich.markdown, etc.). The library handles cross-platform terminal differences including Windows legacy console API calls via ctypes, Jupyter notebook HTML rendering, and Unicode width calculations across 21 Unicode versions. External dependencies are minimal: pygments for syntax highlighting and markdown-it-py for Markdown parsing. The codebase demonstrates exceptional craftsmanship in its terminal rendering pipeline, careful handling of edge cases (CJK width, emoji variants, control codes, broken file-like objects), and a well-designed protocol system that enables arbitrary composition of renderables. The Segment-based rendering architecture is both performant and elegant, allowing style application, line splitting, and cell-width calculations to be composed as transformations over segment sequences.