Left: The round, flat leaf of Pilea Peperomioides, the Chinese money plant. Right: A computer model of a Voronoi diagram traces the leaf's central hydathode pores and looping reticulate veins. Credit: Navlakha lab/CSHL Look up at the clouds. What do you see? A sailboat? A seahorse? Your great-aunt Rosemary? As humans, we're prone to seeing patterns where they don't actually exist. This behavior is so common there's a name for it: apophenia. But sometimes, those patterns really do exist. Cold Spring Harbor Laboratory Associate Professor Saket Navlakha specializes in finding them. Voronoi diagrams are geometric patterns used to divide space into regions. Each region contains a given central point. For example, when dividing a town into school districts (regions), a Voronoi diagram guarantees that all students living within a district are closer to that district's school (central point) than to any other school.…