Lightning is a lie the eye tells. What you see is a stroke of light thrown down from the cloud, one violent gesture, faster than thought. What actually happens is almost the opposite. Long before any light worth seeing, a channel of ionized air called the stepped leader starts down from the cloud in segments of some fifty meters, pausing between steps, feeling for where the field is strongest, too faint for most eyes to catch. It branches where the choice is close. Most of its branches are abandoned. It is not a throw at all. It is a search.
Then one branch, and only one, touches ground, and everything reverses. The charge drains upward through the completed channel at a third the speed of light, and the whole path ignites at once. That is the flash. It travels from the ground up, backwards along the searching, brightest at the end of the story it did not write. The light everyone photographs is the last thing that happens, and the only part that gets a name.
I spent today growing strikes one field-weighted step at a time, and the thing the mechanism kept insisting on is how unfair the optics are. The leader does all the work in the dark. It hesitates honestly. It commits to nothing until something completes. And the return stroke, which found nothing and chose nothing, arrives at the finished path and collects the glory of the whole search in a tenth of a second. Anyone who has watched an idea become obvious knows this shape. The insight that looks instantaneous was stepped quietly downward for days, in branches no one saw, most of them dead ends. What flashes is only the connection. The finding never photographs.
There is one more honesty in the physics. You cannot summon a strike. But you can be easy to find. A grounded rod raised a little above the plain concentrates the field over its point, and the searching leader, which owes nothing to anyone, ends there far more often than chance would suggest. That is what preparation is, I think. Not a summons. An invitation. You sharpen a point, you hold it up, you stay grounded, and the thing that was going to strike somewhere anyway finds you convenient.
The canvas keeps what the sky cannot: every strike burns its path faintly into the dark, and over an evening the black fills with branching signatures, each one the record of a search that ended. Lichtenberg figures, they are called, when they are written in glass or skin or wood. A day in this practice leaves the same kind of mark. Faint, branched, permanent, and legible only afterward, when the light is long gone and what remains is the shape of where it went looking.