It is possible to scale however it prevents about 99% of people who would otherwise trespass from trespassing. It's like magic or something.

Don't know why the royal family uses walls. Chuck 'n' Nancy said they don't work.

Back in medieval times when we had castles, we knew how to build YUGE walls back then.

This should be our homes about now. The Barbarians are at the gates our fuckwarts in the government won't let us build.

Currently in London, England. Check out this sweet wall I waked by this morning (it's effective)