"The carbon cycle is like a Library.
The books on the shelves and on loan to the readers represent the carbon locked into biological systems and the CO2 in the atmosphere respectively."
see the linked video...
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.