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Images from a numerical simulation of turbulent fluid convection showing horizontal slices of the temperature at early time (left) and at a later time (right); rising plumes are in red and yellow, sinking plumes in blue. The simulation shows that over time the spatial distribution of the plumes changes dramatically as they cluster into disjoint groups. [Antonio Parodi, Jost von Hardenberg, Giuseppe Passoni, Antonello Provenzale, and Edward A Spiegel, Phys. Rev. Lett. 92, 194503 (2004)]

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