If you've ever found an auction invitation slipped under your stateroom door mid-cruise, you're not alone. Art auctions are a staple onboard many large contemporary and premium ocean cruise lines, typically run by third-party galleries like Park West Gallery, which partners with Carnival Cruise Line, Norwegian Cruise Line, and other major brands. The events are designed to be welcoming to first-time collectors, and complimentary Champagne or mimosas are usually part of the deal.

The auctions are just one piece of a broader art-at-sea experience. Cruise lines spend considerable effort curating artwork that reflects each ship's identity — from Norwegian Cruise Line's commissioned hull murals (its newest ship, Norwegian Luna, features the 12 zodiac constellations painted by street artist ELLE) to Disney Cruise Line's deep dive into its animation archives. On the Disney Wish, fairytale castle motifs line the aft staircases, while the Disney Destiny leans into a heroes-and-villains theme, complete with a statue of T'Challa in the Grand Hall. Disney ships don't hold auctions, but guests can order artwork through an Art on Demand kiosk and have pieces shipped home.

For those who do participate in auctions, the logistics are generally handled for you. Winning bidders work with the gallery for framing and shipping, with pieces typically arriving at home within a couple of weeks of disembarking. Carnival's program also donates a portion of auction proceeds to St. Jude Children's Research Hospital. On the luxury end, some lines — like Regent Seven Seas Cruises — skip the sales model entirely, instead maintaining museum-quality onboard collections curated by an art director, meant purely to enhance the guest experience.

Before raising a paddle, travel advisors suggest researching the artists featured and comparing prices to what you might find on land. The value of cruise ship art can vary widely, and an informed buyer is a happier one. That said, for some guests, the purchase is less about investment and more about memory — one Arizona woman bought two pieces aboard the Carnival Sunshine that reminded her of her late mother, and she says they make her smile every time she walks past them.

This story was originally reported by USA TODAY.