BASE – Bridge Aerial Span and… Emountain. Or something.
Anyway, base jumping (parachuting off of objects already on the ground, such as sky scrapers or the Eiffel Tower) had become too boring and the challenge was constantly to get far away enough from the launch object before you scraped your body along it. Suits with little wings built into them were devised to make the movement easier… And of course that means that it’s now the challenge to see how close you can fly to the ground/moutain, etc. without splattering yourself all over it at 100mph.
How close can you get to the walls? It turns out that it’s about a foot or two.
Really, there is some amazing footage in this video: http://www.biertijd.com/mediaplayer/?itemid=4262