In the main garden, a temporary pavilion designed by Ryue Nishizawa, with an arched wood canopy, hosted the conversations, including one on the second day between Sejima and artistic director Yuko Hasegawa about Inujima Island. The small island (population: 47) was transformed in 2008 into an art destination, housing an environmentally sustainable museum, site-specific artworks, and permanent installations that its remaining residents (whose average age is 75) enjoy daily alongside visitors. Later, musician Keiichiro Shibuya played the piano as an android robot called Alter 4, designed by innovator Hiroshi Ishiguro, danced. Nearby, guests, including many families with young children, picnicked; the day before, several had participated in the workshop “Kids Making Hats,” by Kaori Shikichi. How do I know this? Many of the children proudly wore their hats, masterpieces of chunky, messy knitting, as they enjoyed their lunch: bento boxes or pizza from a local restaurant that had brought in a brick oven for the occasion and was cooking each pie as it was ordered. Under the trees, music drifted over from the pavilion and nearby restaurant — it was an oasis from the city, though if you listened closely enough, you could still hear the sounds of urban life underpinning it all.