Generate an image depicting a sailboat sailing on a turbulent sea within the confines of a spherical floating island. The island should have a surreal quality, with elements of fantasy and mystery. The sea within the sphere should appear to cascade over the edge into a black abyss below as the ship navigates towards the edge. Emphasize the contrast between the contained world within the sphere and the infinite darkness beyond, echoing the iconic imagery of the Kansas album cover 'Point of Know Return