In the invisible architecture of matter, even the smallest asymmetry can quietly undermine the pursuit of order. Researchers at Rice University have identified a subtle but consequential flaw in the standard method for assembling magnetic particles into crystals — a lag between a rotating magnetic field and the particles' response that creates unintended directional preferences. Their remedy is disarmingly simple: rotate the field just slightly beyond a full turn, by a precisely calculated fraction, and the bias dissolves. It is a reminder that in science, as in life, the difference between im