When the Kosovar artist Petrit Halilaj received an invitation for his biggest project ever in the United States, he knew just where to go: back to school.
For “Abetare,” his spare, smart, absolutely delightful sculptural installation on the roof of the Metropolitan Museum of Art, Halilaj, who is 38, traveled to elementary schools across southeastern Europe, documenting the doodles that generations of schoolchildren left on their desks and walls. (The project’s title refers to the Albanian-language ABC book from which Halilaj learned the alphabet.) Those children’s drawings from the Balkans formed the templates for the sprightly, sometimes bawdy bronze and steel sculptures that now garland the skyline of New York — large ones, but also flowers, birds and graffiti that nestle in the topiaries, and hide behind the cocktail bar.