Here, the glistening Rose Line took a ninety-degree vertical turn and continued directly up the face of the obelisk itself, ascending thirty-three feet to the very tip of the pyramidical apex, where it finally ceased.
He watched it rise to the apex of its climb… hovering for a moment in the void… and then tumbling downward, end over end, back toward the stone floor.
The miniature structure itself protrudes up through the floor as though it were the tip of an iceberg—the apex, of an enormous, pyramidical vault, submerged below like a hidden chamber.
There are no more uses of "apex" in the book.
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Cables radiate from the apex of the building to the edge beams.
We were rising fast and it seemed like the hollow would miss us, but just as it reached the apex of its jump, one of its tongues shot out and lassoed Emma around the ankle.