DS1 has had a compulsion to look over fences for a few years now. As he gets taller (he's 9) he can look over bigger fences.
If you look at my profile you will see a photo taken of him today - he can get his knee higher than shown in the photo so he can get practically over the fence.
The problem is that the roofs of the houses behind that fence are level with it. In other words there's a very big drop behind there. He's severely autistic (non verbal) with absolutely no sense of danger. In between doing this today he's been jumping from bannister to bannister 3 storeys up. (am I spelling storey right?)
So any ideas of what I can do? The fences are at their legal maximum height. Removing the chair just leads to him shifting the trampoline or wendy house or anything he can lay his hands on - which is even more dangerous. Or climbing up from the decking. Last year he was satisfied with a periscope, but last year he didn't have the strength to pull himself up - this year it's viewed as a poor alternative.
He can't quite manage it yet, but give him a few weeks and I think he will. And I then dread to think.......
It's a compulsion so very hard to deal with behaviourally. He doesn't have the language for social stories.