Board Thread:Questions and Answers/@comment-26174543-20160322142028/@comment-6986530-20160322214523

The Ark is more consistently described as a white pen, actually. Some people have suggested it's supposed to be a rocket ship.

As for the temple, in Pierrot it was described by SoE's not-translation as being lined with countless white pillars with a very long staircase extending between them. Going up the stairs you find an open square accessed by three other staircases, one on each side, and in the center is the Ark.

(There might also be statues.)