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Large size effects are experimentally measured in lattices of triangular unit cells: about a factor of 36 in torsion rigidity and 29 in bending rigidity. This nonclassical phenomenon is consistent with Cosserat elasticity, which allows for the rotation of points and distributed moments in addition to the translation of points and force stress of classical elasticity. The Cosserat characteristic length for torsion is l t ¼ 9.4 mm; for bending, it is l b ¼ 8.8 mm; these values are comparable todoi:10.1103/physrevlett.120.065501 pmid:29481282 fatcat:asflwescxfegjfjpzc67pedouu