"Edderkoppen er opp på veggen" is not accepted?
That's right. "Opp" would only be used when the subject is in motion.
Thanks for the clarification! So "Edderkoppen går opp på veggen" would be okay?
Yup!
So opp is a verb?
No, it's an adverb, I believe.
What about "står opp på ..."? Does that work? Having conjugations for motion sounds really weird.
"opp" implies movement, so I doubt "står opp" would be used, here.
Why "oppe" and "på"? Is it not too much?
I think "oppe" means "up" and "på" means "on".
Kan man skrive: "...står oppe på..."?
What's the difference between oppe and oppå?
Yes please, why is it not opp instead of oppe?
would "oppå" instead of "oppe på" not be acceptable here?