I wonder how a Tree Climbing seat would work on them vertical pipe looking things??
In September 2005 some thousands of sub-Saharan African migrants tried to climb over the fences in several waves moving upon Melilla. About 700 made it past the fences while six died in clashes with Moroccan security forces.[2] The 2005 events at the Melilla and Ceuta border fences are the subject of a documentary film, Victimes de nos richesses.[3]
Before the third fence came to be implemented following this and similar incidents, the mountainous buffer zone between Spanish and Moroccan border patrol positions that lies next to the fence registered hectic activity with African people provisionally camped there while preparing massive assaults on the fence, something which became a tactic in order to outnumber the Spanish border patrols.
https://en.wikipedia.org/wiki/Melilla_border_fence
So far the new fence has succeeded in deterring new intrusions and the sub-Saharan camp sites in the buffer zone have mostly disbanded. From these, Amnesty International and Médecins Sans Frontières accused the Moroccan government of dumping people from various African countries (some of them claiming to be validly registered as political refugees) in an uninhabited area of the Sahara Desert without food or water supplies.[4]
HMMMmmm....
I’m sorry, I don’t know anything about them. I just watched a few videos on YouTube and there do seem to be quite a large number of different designs. So a person might be able to find one that would work on our new bollard fence on the Mexican border, but I’m definitely the wrong person to ask about that!