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The image shows three plastic components (cut from a polymethylmethacrylate sheet using a laser cutter to form the letters G, M, and W) levitating in an aqueous solution of MnCl2 between two NdFeB magnets. The letters have a preprogrammed distribution of densi‐ties, which is achieved by applying tapes with different densities to their surfaces. As reported by George M. Whitesides and co‐workers on page 4134...
Magnetic levitation (MagLev) enables 3D self‐assembly of diamagnetic objects with control over many aspects of position and orientation. This work demonstrates the ability of MagLev to position and align components, such as mirrors, filters, lenses, and soft objects, without mechanical support.
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