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The handful of states a tile on the wall can be in.
How tiles are fitted together.
Colour schemes for the wall.
What the wall does when there are more jobs than comfortably fit on the screen.
Tile ordering on the wall.
One job, reduced to everything the wall needs and nothing else.
How a tile signals that its job is building right now.
The silhouette of a tile.
Common contract for the small enums that make up a wall's look: each constant has a stable id
that survives config round-trips (and shows up in CSS as a data- attribute) plus a human
label for the drop-downs.