Lattice packing of pennies in a plane.(Base image of a US penny, via Wikimedia Commons.) |

Random packing of isosceles triangles in a plane using a variant of the Lubachevsky-Stillinger algorithm.(Illustration by L. Salgo, via Wikimedia Commons.) |

The well-known cannonball (close-packing) arrangement of spheres (right), along with the illustration that Johannes Kepler (1571-1630) used when making the conjecture that this is the densest possible arrangement. (Left image by "Greg L," and right image from Johannes Kepler's 1611 Strena Seu de Nive Sexangula, both images via Wikimedia Commons.) |

Monte Carlo simulation of packing of hard ellipses.(image from the ChaikinLab Condensed Matter Physics Laboratory at New York University.) |

Jessica Young, a high school student and an intern at NIST, doing a packing experiment.Young's work aided NIST research on how rigid aggregates tend to clump together at roughly the same density regardless of scale. (Image: Baum/NIST.) |

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- Supporting information for ref. 13 (PDF File).
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