"You can explain that parallel processing is like a ballet. There is the corps and the principles. The performance begins and ends at the same time. Sometimes they dance at the same time executing their steps together sometimes as a reaction to what the others are doing (think of criss-crossing lines!) you can get some great video from youtube to demonstrate it. "
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.