Video of the cube variation 4.
Minimal, perhaps. Two segments. First I knit a zigzag in lighter yarn, attaching the zigzag to itself as I went. This formed half of the cube: 3/4 of 3 faces and 1/4 of 3 other faces: (3 * 3/4 face) + (3 * 1/4 face) = 3 faces, or half of a cube (6 faces). Then I knit a zigzag in darker yarn, attaching the darker zigzag to the lighter colored zigzag and to itself as I went. At the very end, I had to graft together half of one edge of the cube.