Traditional Anglican ping, continued in memory of its founder Arlin Adams. Apophatic theology is the way Orthodoxy does theology. It does not lead to "pluriform truths". There is only one Truth. In an nutshell, an apophatic statement can be made thusly, "God is not...." It can never be "God is whatever you think he is because I can't define God so your definition is as good as mine." That's just hogwash, not theology.
Puhleeze. Grace Cathedral is heresy central, but it's so well done and tasteful that nobody ever challenges them. Also, Grace Cathedral (through the bishop) is one of the major promoters of URI, the "United Religions Initiative," a UN-linked thing from the city that gave us the UN in the first place. The URI seems to attract mainly elderly Episcopalians, and is currently trying to get them to leave it all their money.
I have family that lives in a building overlooking Grace Cathedral, and when I spend time with them, I greet every dawn by watching flakes walking around the Grace Cathedral "labyrinth." All told, however, the labyrinth is pretty harmless compared to the URI.