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Elisabeth Sonrel (French, 1874 - 1953), "Les Hirondelles; Souvenir", ("The Swallows of Remembrance") #mucha

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"The Swallow's Tail" was Salvador Dalí's last painting, based on the mathematical catastrophe theory of René Thom. It was taken from Thom’s four-dimensional graph of the same title, combined with a second catastrophe graph, the s-curve dubbed, 'the cusp'. Thom’s model is alongside the curves of a cello and the instrument’s f-holes, which, as they lack the small pointed side-cuts of a traditional f-hole, connote the mathematical symbol for an integral in calculus: \int_{}^{}."

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Recipes for a Leap Year Birthday

For all the leap year babies out there. Happy Birthday! (Photo: Andrew Scrivani for The New York Times)

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Swallows. The return of the swallows is something I look for each year. They tell me summer has arrived.

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