  Disclinations in a 2D sheet create regions of Gaussian curvature whose
inversion produces a reconfigurable surface with many distinct metastable
shapes, as shown by molecular dynamics of a disclinated graphene monolayer.
This material has a near-Gaussian "density of shapes" and an effectively
antiferromagnetic interaction between adjacent cones. A $\sim10$ nm patch has
hundreds of distinct metastable shapes with tunable stability and topography on
the size scale of biomolecules. As every conical disclination provides an
Ising-like degree of freedom, we call this technique "Isigami".
