There’s no way around it: this is pretty neat. This here video shows a bunch of teenagers, from Japan, running a sky-diving simulation using nothing more than Google Earth and a projector+blank mat.
The kids hook up a laptop running Google Earth to a projector, then project the image onto the white space. They’re then suspended over the map and Google Earth is made to zoom through the different zoom levels, giving the sensation of going sky-diving.
Fans are then added to give everything a little bit more realism.