According to Einstein's theory, massive objects cause spacetime curvature, like a heavy ball warping a rubber sheet. As they accelerate, they create ripples — gravitational waves, akin to the circles from a stone dropped in a pond. Usually, these ripples come in only two types: they alternately stretch and squeeze space. But some theories predict other oscillations. Some 'breathe' evenly, pulsating in all directions, while others twist space like a whirlpool. The future space detector LISA will hunt for such unusual ripples from pairs of giant black holes. Calculations show LISA is especially sensitive to twisting waves — detectable 2–3 times more precisely than breathing ones. It's like picking out a whisper from the noise. The precision will reach billionths: akin to weighing a grain of sand and noticing if it becomes heavier by a thousandth of its mass. Even faint deviations from Einstein's theory won't escape LISA — and perhaps we'll learn that gravity not only attracts but also twists space itself.