Mathematically-speaking, a bubble (untwist or twist-out) is a twistor with non-negative potential. It is the opposite of a vacuum.

Bubbles represent the maximum amount of twistor space (handicap = $max) per some given opus.

Ludologically, a bubble will yield a dividend, for it has convex curvature against the handicap in twistor space.
(see also bubblegum, zero bubble)

Notes (+): +Both bubbles and vacua output the same absolute value.

+Whereas a deflaton will depress every point in its vector field, an inflaton will blowup a function at a single point.