Fifty-one published similarity matrices, from Ekman's colours to Rothkopf's Morse code. Left: a nonmetric MDS solution in 1, 2 or 3 dimensions. Middle: stress against the number of dimensions, the curve used to choose how many are needed. Right: the dendrogram from agglomerative clustering; the slider cuts the tree and colours both views by cluster. All fits were precomputed in Python; the page only draws.