The zero-bubble (also written as "0-bubble" or "0b") or "sponge" is a bubble shapeframe (stereogram*) with no inflatons (scalar fields responsible for blowup from a single point [0-brane]). A 0b is a type of homeomorphism as a totally twisted loop, and formally marks the end of a proof.🔲Greater than or equal to three (3) spatial dimensions.

Note (+): The supposition for 'zero' (+/-) is that when tabulating the yield, all spots on the mesh which would allow for an opening, vanish (0,0).

Sponges are the ideal [most secure🔐] ¢ent structures [keys] for a closed🔒 string (and thus, fibor). Taken by themselves, zero-bubbles (frictionless assets) are considered solved puzzles (ie. completely mapped/encrypted/melodic).

Function map: spongefibor