For example, the endless vista of clear blue sea fails to provide much greenery to ease the eye - apart from the odd tropical island.

For the owner of a forthcoming craft named WallyIsland, however, this will not be a problem.

For he, or she, will have a personal ocean-going garden.

The 325ft-long yacht is to feature a growing area with shrubbery and flower beds, kept healthy by an irrigation system.

It will also have a tennis court, pool and five accommodation decks including a main saloon, dining room, library, cinema, spa and fitness area.

The fuel tanks are so large that they allow for five years of cruising without having to stop for a fill-up.