Comparing the level of convergence in category systems that emerged in small (N = 2) (a) and large (N = 50) (b) populations. Each row displays the category system constructed by a single unique population in each condition after 100 rounds of interaction. The horizontal axis displays the image continuum of shapes, consisting of 1500 slices. Density distributions display the frequency of successful coordination for each label, as well as the region of the continuum to which each label referred. Each color indicates a unique label. Similarity in the category systems across independent populations indicates convergence.