Maybe this can lead to some absurd things that make no sense, but sometimes it may be enlightening. For instance, we think that gravity is an attractive force. Maybe we can ask "What if it's really repulsive instead"? What would it take to make gravity be repulsive and still see the results we see from experiment? Do the manipulations required to get it to work also seem to correspond with reality? This might not be a good example but in general can or has this method be used with other phenomena to better understand them or perhaps discover new things? Why not throw bizarre things like this against the wall and see if anything sticks? What if light is really not moving at all and everything else is? What if mass really decreases as you accelerate? What if objects don't spin but instead the universe spins around them? What if galaxies are not flying apart but instead are actually getting closer?