the environment affects how quickly the piece must be completed to avoid the effects of melting; if the sculpting does not take place in a cold environment, then the sculptor must work quickly to finish the piece. Some sculptures can be completed in as little as ten minutes if the carver is using power tools such as chainsaws and specialty bits fitted to a die grinder. Ice sculptors also use razor-sharp chisels and hand saws that are specifically designed for cutting ice. As various technologies are adapted for use with ice carving, many sculptures are now created largely by machine. CNC machines and molding systems are now commonly used to create ice sculptures and complicated logos from ice. Color effects are also possible by a number of techniques, including the addition of colored gels or sand to the ice. This art form is traditionally taught in culinary schools using text books such as Ice Sculpting the Modern Way, Joseph Amendola's Ice Carving Made Easy and Mac Winker's Ice Sculpture: The Art of Ice Carving in 12 Systematic Steps. There are also small schools that teach ice carving. The ice may be turned clear after carving by applying heat from a Propane or Mapp Gas cylinder. This alters the opaque effect that is obtained when carving. The ice turns clear after the outside is melted. Caution is to be used as the ice melts very quickly and could soften edges and contours. Sometimes distilled water is used for enhanced clarity. Uses Ice sculptures feature decoratively in some cuisines and may be used to enhance the presentation of foods, especially cold foods such as seafood or sorbets. The story of the creation of the dish Peach Melba recounts that Chef Auguste Escoffier used an ice swan to present the dish. At holiday buffets and Sunday brunches some large restaurants and hotels will use ice sculptures to decorate the buffet tables. Cruise ship buffets are also famous for their use of ice sculptures. Ice sculptures are often used at wedding receptions, usually as some form of decoration. Popular subjects for ice sculptures at weddings are hearts, doves, and swans. Swans have a reputation for monogamy, partly accounting for their popularity. Ice sculptures may be used at a bar, in the form of an ice luge, or even the entire bar may be made of ice. Ice sculptures with high surface area like in