They passed a staircase where on the wall beside it, the word "POOL" was stenciled, along with an arrow pointing up. "The pool on the roof," Brinn explained, "is surrounded by a tropical botanical garden in which every species is labeled and described. The pool itself is made of bluegreen tiles patterned with birds and flowers, so that when the clear plastic ceiling is opened is opened, the sun shines directly on clear turquoise water. We do not have time to go there today."