More than 20,000 people attended the museum's opening weekend.
The existence of the two works was announced in the space of a day
The deal sees the museum take several of Eliasson's works into its collection.
The artist's first major New York museum show will feature the fabric recreation of his former apartment in Chelsea, New York, alongside the rubbings he made of its surfaces and details to create the walk-through installation.
The National Gallery of Art presents Women and the Index of American Design, an exhibition celebrating the hundreds of female artists who recorded thousands of quilts, works of folk art, and everday objects during the 1930s in an extraordinary Federal Art Project. January 16 until June 13.
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