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"The Ultimate Mirror System" is [or was] more of a Theory rather than a Design Pattern or open API. The Best I could find on the topic was a Paper by X and at Sun Micro-systems: Mirrors: Design Principles for Meta-level Facilities of Object-Oriented Programming Languages which is published through http://www.sigplan.org/ -- they outline the years and accumulate the issues as so:

• The ability to obtain metadata from systems executing on
platforms that do not themselves include a full reflective
implementation. Examples:
- Small, memory-constrained devices or embedded systems
- Deployed applications where concerns of footprint,
security or bandwidth have discouraged or precluded the
deployment of built-in reflection support.
• The ability to dynamically add/remove reflection support
to/from a running computation.
• The ability to deploy non-reflective applications written in
reflective languages on platforms without a reflective implementation,
reducing footpr