sentences:  The greater part of this knowledge store would be free to all via the Internet, however a commercial marketplace of related products and services was envisioned to co-exist, in part in order to support the expensive infrastructure such a system would require.The origin of the idea can be traced back to Buckminster Fuller's Geoscope, a large spherical display to represent geographic phenomena.Many aspects of his proposal have been realized - for instance, virtual globe geo-browsers such as NASA World Wind, Google Earth and Microsoft's Bing Maps 3D for commercial, social and scientific applications.