"There's one trunk (main sewer line) that runs water waste out of the home. There are multiple small branches (secondary lines) that feed into that main line."
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.