There are both conventions used to describe motion relative to time. Typically miles per hour is linear or close to it, and hertz is cyclical.
"This LAX Hertz is like Ellis Island but with longer waits and more diseases. I think I just saw an old man sneeze and his lips fell off"
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.