Chladni figures of discrete square

Here are the Chladni figures (nodal curves) of all the eigenvectors of a discrete cylinder C4 x L4, a graph with 56 vertices and 152 edges. Click on a picture to see it larger. See the "The graph spectrum of barycentric refinements" or Sard theorem for graph for the math and mini blog, the same pictures for of a polyhedron. a triangle G3, for a triangle G3 of triangle, rounded disk, or square, or