So, I know that in Yumi, Design stated that time travel to the past is impossible in the cosmere, and my question takes this into account. Since gravity is not its own phenomenon, and is actually a function of space-time, I am wondering what basic lashings actually do. In order to change gravity, a surgebinder must change one of three things: Space-time, the lashed object's mass, or everything else's mass. A basic lashing most likely affects the second one, as that is much simpler. BUT, a basic lashing can change the direction of gravity, and that would require altering space-time. Can a surgebinder alter spacetime separately from a basic lashing? I am also curious of half and double lashings. Since a double lashing doubles gravity, it must also double time. Meaning that from a lashed object's perspective the rest of the cosmere would be moving half as fast. One may think of this as gravity actually staying the exact same, and only time changing speed relative to the lashed object. Therefore, from a windrunner's or skybreaker's perspective, they would have trouble telling how gravity is changing, and would only perceive a change in time. A half lashing may be even more bizarre. Half lashing an object upwards would either not change relative time at all, or would stop time altogether. The second option means that an object would experience infinite time before any of it's stormlight would dissipate. From an outside perspective, this would mean the object would instantly experience infinite time, making it explode/disintegrate/stop existing altogether. A quarter lashing instead would either make time reverse, or slow down the object's time. From the object's perspective, everything else would be twice as fast, while its relative time would remain normal. I also wonder if a negative lashing is possible and what this would do to gravity and time. And also what sort of time travel a reverse lashing would induce. A negative lashing may be the same as lashing in the opposite direction to normal gravity. Also, if a negative lashing or quarter lashing is what creates time travel to the past, should it not be impossible in the stormlight archive?