The Ellis Cube: 4-Dimensional Math Structure

The 4 Independent Axes
Dimension 1 (X) Local STEM Skills Xc,f
Dimension 2 (Y) Industry Demand Yc,f
Dimension 3 (f) Field Index f ∈ F
The "Stack" of industries.
Dimension 4 (c) City Scaling c ∈ C
The "Multiverse" of locations.

Why it is a Cube

Because all 4 axes vary independently, the math describes a Tensor (a 4D object), not a simple 2D graph. You cannot flatten it without losing data.

The "Shadows" (2D Projections)
Mismatch Triangles
A slice of the cube showing the gap between X and Y for a single field.
Fitted Parabolas
Projecting the "Field Stack" (Axis 3) onto the City Plane.
Import Pressure
The result of scaling Axis 4 (Cities) against local constraints.
Tensor T = (Xc,f, Yc,f) over {F × C}