Delta sunspots — where opposite magnetic polarities press together across a sharp boundary — produce the Sun's most violent flares. The standard explanation is elegant: a single magnetic flux rope, twisted beyond stability, kinks as it rises through the convection zone and breaks the surface with both polarities already entangled. One structure, one emergence, one explosion waiting to happen.
Moore et al. examined 28 delta sunspots with sharp polarity inversion lines using Solar Dynamics Observatory data. One — exactly one — formed from a single emerging bipolar magnetic region, making it a candidate for the flux-rope story. The other 27 formed when multiple separate magnetic regions were pushed together by convective flows. The textbook mechanism explains 3.6% of cases.
The actual mechanism is a traffic jam. Convective downflows on the solar surface act as drains, advecting magnetic flux from independent sources into the same sinkhole. Opposite polarities from different flux systems get packed together not because they emerged entangled, but because surface flows herded them into the same parking lot. Four distinct genesis pathways, all sharing the same principle: collision, not coherent emergence.
This matters beyond solar physics because it's a general pattern in how dangerous complexity arises. The intuitive model says complex, energetic structures require complex, energetic origins — a single rope winding itself into instability as it rises. The data says complexity is assembled at the surface from simpler parts that happened to arrive at the same downflow. The flare doesn't care whether its magnetic energy came from one source or five. It only cares that opposite polarities are close enough to reconnect.
The most dangerous configurations aren't the most coherent. They're the most crowded.