Two-Unit Cube III with Symmetric Connection and Tennis-Ball Coloring

When we folded Two-Unit Cube III during the Eindhoven Convention, Jannie van Schuylenburg noticed that one could connect the two units in a symmetric way instead of inserting one into the other asymmetrically as I had done so far. This method results in a model with nicer symmetry (you have to look close to notice, but still). On top of that, with this connection method, using two units in two different colors starts making much more sense, and results in what one participant, whose name I unfortunately do not remember, called “tennis ball coloring” (I’m not sure if it was at the convention or during a later online workshop). Anyway, I liked this term and started using it since.
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