For a generation, every code built to protect quantum computers from their own errors has used the same shape: a grid, like graph paper, where an error is caught only because its neighbours notice something doesn't fit. Nobody ever proved the grid had to be that shape; it was just easy to describe. On the newest hardware, individual atoms are pinned in place by laser light, and applying a correction can mean physically moving them - and movement costs time these fragile states don't have. On a plain grid, the distance between linked points grows every time the machine scales up. A new design folds the grid instead, using a symmetry exact enough that folding it in half lands every point on its matching partner, turning opposite corners into neighbours. The longest distance any correction has to travel stops growing at all, however big the machine gets.