The project submitted a video to the United Nations for the 2009 COP15 Copenhagen Conference on Climate Change which was presented at Denmark's National Gallery.
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With his sculpture group Penelope (1845–46, Danish National Gallery), which won international acclaim, he moved away from the static Neoclassicism and towards a more dramatic and dynamic style.
In the collection of the Prince of Orange at Brussels was a painting by him of a knight kneeling, with four sons, and in the Copenhagen Museum is a Man's Portrait by him.
Others are held in the collections of the countess of Vogüe Commarin at Dijon and the Statens Museum for Kunst in Copenhagen - the latter is the oldest but only shows the head and shoulders.
The pictures were lost in the first days of World War I "and subsequently confiscated, or threatened with confiscation", but "they survived intact even though they never returned to Paris, resurfacing after complex and protracted negotiations in private hands in Copenhagen (where many can be seen today in the Statens Museum for Kunst)." (Spurling, 2003).