Think beyond conventional material properties. Engineered structures open possibilities for thinner lenses, lighter components and new ways to control sound—but a compelling demonstration is not yet a commercially viable product. Discover where metamaterials, whose engineered structure gives them properties chemistry alone cannot, are already reaching products, and what must change in cost, manufacturing and testing before they reach yours. • What can engineered structures unlock, and where are they already reaching products? • What limits scale: cost, production, durability or validation?