Lattices of micrometre-sized metamaterials embedded in thermoresponsive hydrogels deform upon heating to reveal encrypted images from a blank gel canvas.
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Liu, Z., He, X. Painting on programmable reconfigurable metastructures. Nat. Mater. 22, 1171–1172 (2023). https://doi.org/10.1038/s41563-023-01668-0
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DOI: https://doi.org/10.1038/s41563-023-01668-0