Attempts to produce a Harry Potter-style invisibility cloak have been improving, but they have so far tended to be too bulky to really compare to clothing. Now, Xingjie Ni of the University of California in Berkely and colleagues have shown that they can be made a mere 80 nm thick – just a tenth of the wavelength of the light for which it works – using nano antennas (gold squares on an insulator) to make a metamaterial that bends light around whatever is to be concealed, rendering it invisible. The current device has to be tailored to the structure it hides and cannot conceal all wavelengths, but is a major step towards turning a storybook idea into reality.