Citations:metacube

Noun: (computer graphics) A visual effect resembling a metaball but with square edges.

 * 2004, Christine Schàpf, Hannes Leopoldseder, Cyberarts (part 1, page 50)
 * In particular, Square metaballs (which I call "metacubes") were used to model algae-like objects. By placing these metacubes symmetrically, a representation of both organic and geometric shapes was accomplished.

A four-dimensional analog of a cube.