Containment, Constellation & Lens
Keep canonical belonging separate from temporary useful groupings.
Containment says where something canonically belongs. A Constellation groups things that are useful together for a particular purpose. A Lens defines the grouping rule.
Your cat can belong to your household, appear in a 'pets at the vet' group, and be part of a 'things in this photo' group without changing households each time.
Primitive needs stable containment for identity, permissions and lifecycle, but real work often crosses those boundaries. Constellations allow temporary or cross-cutting groupings without rewriting the canonical tree. Lenses explain why those items belong together in that view.
Where this concept shows up
Containment
Represents canonical parentage or ownership-like structure used for stable lifecycle and scope.
Constellation
Represents a cross-boundary grouping that remains useful under a declared lens without becoming the canonical parent.
Lens
Defines the grouping rule, for example geographic, functional, relational, incident-based or inquiry-based.
Source lineage
Concept pages preserve whether an idea is canonical, proposed or working theory. That label is independent from whether a related product feature is implemented.