At a successful wine bar visit (Noir) after a failed attempt at seeing a Bollywood film in Pasadena, our friend Joel, a math professor, began to explain optimal grid packing in terms of how a grocer stacks oranges. If you have an infinite number of oranges, stacking them as a grocer would is, apparently, optimal.

Jill: “But nobody has an infinite number of oranges!”
Joel: “Nobody except a mathematician!”