can see that's moving there's another think really faint one here and then there's two right here that you can see very clearly on this part of them disappear mostly up up in that section okay awesome so we have you know we can play with simulated data synthetic data and the cool thing about that is you know we can we know everything about it and we can try to make it realistic we also have real data and the problem with real data is we don't have any ground truth for the depth which is a which is a very tough problem and there's a whole body