That pitchside advertising board isn’t showing one ad. Depending on where you’re watching, it’s showing four completely different ones at the same instant, and your eyes will never catch it. The trick is called parallel advertising, and it exploits the gap between how a camera sees and how you see. A standard broadcast camera doesn’t capture continuous motion. It samples the world in discrete frames, its shutter synchronised (genlocked) to a fixed timing signal. A modern LED perimeter board can refresh far faster than any single camera samples, which opens a door. Here’s the mechanism: - The LED board cycles through up to four separate advertisements in rapid succession, interleaving them frame by frame at frequencies beyond human flicker fusion (~50-60 Hz). - Each broadcast camera is phase-locked to a different slice of that cycle, so it only ever records one of the four streams. - A feed bound for Brazil captures the Portuguese-language ad; a feed for Japan captures its own; a sta...