There's an algebra of graphics. It's primitive objects, superposition translation, rotation. Or music. It's notes and temporal sequences and chordals—same thing. And I think this goes back to seeing how the wind works and how the planets move. It's an invitation to go down and find out how things work and learn the things that make up the algebra—the processes and the primitive things. So yes, that fifth area, as you call it, is just what's common about all of these things.
