the circular beta ensemble is a family of random unitary matrices whose eigenvalue distribution plays an important role in statistical physics. the spectral measure is a canonical way of describing the unitary matrix that takes into account the full operator, not just its eigenvalues. when the matrix is infinitely large (i.e. an operator on some infinite-dimensional hilbert space) the spectral measure is supported on a fractal set and has a rough geometry on all scales. this talk will describe the analysis of these fractal properties. joint work with raoul normand and balint virag.