The new Viking Ocean ships — the identical Viking Sea and Viking Star — are gorgeously crafted temples of modern residential design. So many spaces on board are chic and inviting, from the airy Wintergarden to the memorably cozy Explorers' Lounge, with its fur throws and fireplace. We sat down with the architect of the ships, Richard Riveire of Rottet Studio in Los Angeles, and were surprised to learn that even with our close attention to the many stunning details in the ships, the design still holds a lot of secrets not readily apparent to cruisers. Read on for the best hidden fine points we learned about on our insider ship tour.