The hierarchy
A Seed is the smallest unit: a single page or article on a single domain. Seeds have topical affinity but no obligation to each other.
A Cluster is a group of seeds that share enough topological overlap to link usefully. Clusters live on one domain but have their own internal hub and spoke structure.
A Constellation is a set of clusters spanning multiple domains that share an underlying thesis. The same topic treated from multiple angles, each on its own site, with cross-site backlinking that reinforces topical authority at the constellation level without concentrating link juice on a single domain.
A Lattice is the full network: every constellation together, treated as one organism for the purpose of pruning, promoting, and reallocating attention. The Lattice Dashboard is how the organism is stewarded -- one control plane instead of one domain at a time.