  In this note we compute the non-planar one loop anomalous dimension of
restricted Schur polynomials that have a bare dimension of O(N). This is
achieved by mapping the restricted Schur polynomials into states of a specific
U(N) irreducible representation. In this way the dilatation operator is mapped
into a u(n) valued operator and, as a result, can easily be diagonalized. The
resulting spectrum is reproduced by a classical model of springs between
masses.
