I know what gravitational lensing is, but that's not what I have in mind (or rather, my gut - while I have a strong hunch about this, I do not want to invest the years of hard study to validate it or more likely end up in a dead end).

My hunch is that rather than space being a contiguous void with isolated mass of gravity behaving like tiny monopolar magnets, at the intersection between different mass systems there are 'surfaces' of some sort like the walls of a bubble in a pile of foam, and that if you could encounter this 'surface' you would either be repelled by it (most likely) or make contact and be able to slide around on it, and then once you got to the angles where walls joins, you would be able to zip along the intersections at great speed in ways that defy conventional physics. I can't really explain it in greater depth, it's an intuition that's half lifelong fascination with looking at soap films and what foam does, and half 'it came to me in a dream.'