Answer: At customs
Explanation:At customs Edward had been asked what the sculpture was,customs ended up labeling it as "kitchen utensils and supplies" and had tried to charge him with an import tax. Steichen refused to pay the duty and therefore led to this going to the Supreme Court. There the sculpture was said to be art and Steichen did not have to pay the tax.
Eliott Carter was an American composer, whose personal harmonic and rhythmic language led to the invention of the term metric modulation. The latter describes frequent, precise tempo changes. In David Schiff's book "The Music of Elliott Carter", it is written that Elliott Carter preferred to call it tempo modulation.
Art is just like any other primary source as it shows what happened in that time era, what everything looked like, how people dressed and so on