MIAMI — The first thing passengers entering the Icon of the Seas and its central walkway the Royal Promenade notice is a gigantic orb structure. Called the Pearl, it is a five-deck tall glass surface supported by steel and lined on the inside with more than 3,000 tiles. Right under it is a majestic staircase, one reminiscent of an Italian palace, that takes guests up to the Pearl Café on one side and a Latin nightclub on the other. Tall windows abound. The Pearl structure allows the ship to have a much more open design and layout, which results in far greater natural light and exposure to the …