Which of Ishi's City experiences connect him with Tushi?

Ishi first begins to notice the connection between him and Tushi in the saldu world when Majapa shows him the baskets. He realizes that he and his cousin have both found a place in this strange place. Later, when they visit the Outer Ocean, the waves bring Ishi a perfect white shell, which reminds him of his dream and is an important part of Tushi's identity. Tushi's dream made her the White Shell Woman, and Ishi's dream has brought him to Outer Ocean. As they leave the ocean and walk across the sand, Ishi imagines that he is walking through the canyon floor with Tushi. He says that their two dreams have been brought together in the saldu world.