Eigenvalues of tridiagonal k-Toeplitz matrices :

These are eigenvalues of tridiagonal k-Toeplitz matrices for k = 3,5,79. They fall on k curves.

Magic square from simple square :

By looking at the lattice of simple square diagonally, you can find magic square.

Are there more univarsal laws ? :

Here is the spectrum of random block matrix [A, A'; B,B'], with A and B following circular law :

If circular law is a 2 norm law, is this spectrum of a 1/2 norm law !?