The most visible are found on the Lawn Club, a half-acre of real grass that tops every Solstice-class ship's stern sun deck area. On Silhouette, the public park has become something of a gated village green, and the space is much more exclusive -- and expensive -- to use than those planted on Solstice, Eclipse and Equinox. Gone is the (free) Corning Glass Show, replaced by the breezy Lawn Club Grill, where participants pay for a combination meatfest and cooking class under open skies. The Porch, a for-fee casual lunch or dinner option modeled after a private deck in the Hamptons, has also been slotted into space previously free to occupy. But the most controversial additions to Silhouette's Lawn Club are the eight alcoves, private cabana rentals that occupy prime real estate in what was a common sunning area on previous lawns.

Silhouette's custom-collated multimillion-dollar art collection is also a key differentiator. Two installments that draw the most shouting, laughing and exuberant pointing: caged birds on video screens and the enchanted forest with piped-in chirps, positioned in a vestibule through which hundreds of passengers walk en route to the ship's specialty restaurant hub.

Still, despite these distinctions (or perhaps in spite of them, considering the Lawn Club changes), Silhouette is nothing if not quintessential Solstice Class. It's the most sophisticated experience you'll find on a nearly 3,000-passenger ship -- see the focus on wine, sleekly styled spaces and upscale dining -- without being overly stuffy. Celebrity does a commendable job of keeping the pretentiousness quota in check by inserting playful touches, like an ice-topped martini bar that features juggling bartenders, the aforementioned cook-your-own steakhouse and another restaurant, Qsine, where passengers are encouraged to play with their food. Solstice-class stalwarts won't miss a beat, and for first-timers, Silhouette will showcase why the series has become one of the most acclaimed in modern cruising.