The Troll Tapestry was an enormous moving tapestry depicting Barnabas the Barmy's foolish attempt to train a group of eight trolls for the ballet hung on the seventh floor corridor of Hogwarts Castle, opposite the entrance to the Room of Requirement.  The small group was portrayed by a forest clearing, and some of the trolls were hitting Barnabas with their clubs. 
Behind the scenes
- According to Harry Potter Limited Edition, there were six trolls rather than eight.
- Harry Potter and the Order of the Phoenix (First appearance)
- Harry Potter and the Half-Blood Prince
- Harry Potter and the Half-Blood Prince (video game)
Notes and references