An invisible film, a quantum field, is stretched over a rubber bagel. While the bagel is small, the film stays taut and doesn't sag anywhere: the vacuum remains empty. But once you stretch the bagel to a certain size, a dent spontaneously appears in the film — the field starts to be felt at every point.
This dent is not random. The magnetic flux threading the bagel acts like an invisible scaffold, dictating the shape of the sag. If a single field line passes through the hole, the dent is unique. Two lines, and the field organizes itself into two equally possible but distinct patterns. Three lines, and there are six variants. The film seems to choose one of the ready-made stencils, even though nothing guides it.
The most curious part is symmetry. Initially, the bagel with magnetic flux looks the same under rotations and translations. But once the field manifests, it often breaks this harmony: the pattern ends up less symmetric than the bagel itself. This resembles how snowflakes suddenly fall from a homogeneous fog: each with its own unique yet strictly ordered shape. The physicists didn't just find these patterns: they calculated how many there are for each number of field lines and showed which symmetries survive and which are destroyed.
In this model, the vacuum fills with the field spontaneously, without any external input — simply because the "stage" has become large enough for the "actor" to appear.