Next she gave the students a list of grammar commands to symbolize and add to the illustration. They could choose any of the commands they liked, or create their own, as long as they copied them down and symbolized them (Montessori has a unique way of teaching grammar which involves using special colored pencils and a stencil).
Grammar Symbols -- What Do They Mean? article link
Each group of Haunted House commands focused on a part of speech and the part of speech was written in the appropriate color, also the strip of paper was on a colored backing. Verbs in Montessori are red so the command might read
She had a whole slew of them including nouns (black) -- like Add a tree to the front yard -- adjectives (dark blue) -- Draw a scary witch in the sky -- plus verb (red), adverb (orange), preposition (green), conjunction (pink), and interjection (gold). Halloween is a great time to teach interjection. Boo!
One of them was Draw maggots oozing out of the windows. I think that was a Verb card. The children spent the entire day working on them. They loved this work!
For Waldorf, this would go under the category of Third Grade Grammar.