Any wall with slats can be foiled in theory with a rope. Just throw a rope with knots tied into it over to the other side and tie it to the slat at both ends. That said, it's a lot harder if it has a rounded top because the rope would be pressed tightly against the wall, making it more difficult to grab on and making the transition to either side feel quite scary.

While you can still climb over a rounded wall with a rope, I don't think many people would be bold or physically fit enough try it. If you were really smart, you could tie loops along the rope and wear a harness and clip-in. That way you would have a rope anchored on both ends and a safety harness. And you can untie the rope from the other side and bring it with you. If they were smart enough to figure that out they probably wouldn't need to climb over a border wall, though. The point of a wall is to reduce the number of crossings to a manageable number. If you stop 95% of crossings, you free up border patrol to pursue the 5% of climbers and serious organized crime.

Any wall with slats can be foiled in theory with a rope. Just throw a rope with knots tied into it over to the other side and tie it to the slat at both ends. That said, it's a lot harder if it has a rounded top because the rope would be pressed tightly against the wall, making it more difficult to grab on and making the transition to either side feel quite scary. While you can still climb over a rounded wall with a rope, I don't think many people would be bold or physically fit enough try it. If you were really smart, you could tie loops along the rope and wear a harness and clip-in. That way you would have a rope anchored on both ends and a safety harness. If they were smart enough to figure that out they probably wouldn't need to climb over a border wall.