Sofa blocking puzzle [duplicate]

Ok, so I've spotted another one of the dot+line patterns that I want to click, however, I don't seem to be able to stand in the right spot to get a perfect circle.

There's a sofa exactly where I need to stand. I can get really close (close enough that I get sparks) but can't quite trigger it.

I've tried standing on the steps behind, but a tree blocks the correct position (can't even get sparks here)

And even standing on the castle wall, but the crenelations are in the way (again, no sparks)

There's nothing else on the correct line of sight.

Is this just very fiddly and I need to keep trying by the sofa or am I missing something?

You are missing something. The piece of metal there doesn't end in a round part, so you can't actually draw a complete puzzle there. But there IS a round part on the metal over to the left. So you need something orange to bridge the gap.