I suppose we can all be a bit woolly headed at times and for most of us, some days are worse than others; particularly true as we get older in my experience.
Imagine what it must be like for any unfortunate individual where that muddle-headed feeling has been transposed from inside to out, visible for all to see.
How it must feel to be encompassed by a weave of thought sapping tendrils whose root structures burrow into the flesh itself.
To be the host for some parasite, slowly devouring your face.
The stuff of horror movies no doubt.
Well not if you happen to be a monument in a city cemetery with an ivy problem. Notice how the parasite attacks only the head and shoulders, leaving the rest of the body apparently normal and appears to start at the top of the head and work down; how sinister is that? Is the ivy trying to tell us something?

but it does look very sinister
Where did you find this picture? Fascinating...