What is a galaxy infinity cube?

Could you please elaborate on what exactly a "galaxy infinity cube" is? Is it a physical object, a mathematical concept, or perhaps a term related to astronomy or cosmology? I'm intrigued by the mention of "galaxy" and "infinity" in the same phrase, and I'm curious to know if this cube represents some sort of infinite expansion of the universe, or if it's a metaphor for something else entirely. I'm looking forward to hearing your explanation.