The way soldiers meet a wall in an obstacle run; they boost 1 or 2 of the team up to the top and then those up there help pull their colleagues up and over.
Just wondered if there might be a way something could be constructed in LEO that could help pull other systems up (not necessarily all the way). I suppose in my head I'm imagining something equivalent to a kind of immensely powerful magnet similar to those used in MRI, but are there any other thoughts or ideas along these lines being, or have been, considered?