Indirect variation is like a seesaw with a variable on either side. When when pushes up, the other is forced down. But when one variable pushes down, the other is launched up.
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.