"the manifest content is like the ostensibly nonsensical visible form of a rebus or picture-puzzle"
It's what is visible and therefore what is remembered when looking at the ocean. A tree can be thought of the same way. It has a visible portion above the ground but a huge portion of this type of organism is in the root system which is below the ground and typically not easy to see or detect.
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.