Background information about what a "Pas de deux" is
In ballet, a pas de deux (French, steps of two) is a duet in which ballet dancers perform the dance together (from Wikipedia : http://en.wikipedia.org/wiki/Pas_de_deux ).
The orbital dance of a close pair filling the Roche lobe
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Adamante J.DonSimoni : Pas de deux, huile sur toile
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