We did this poem in our class too, the strongest form would be allusion because the crystal stair, and all the stuff on the stairs represents her life and the hardships in it.
Answer:
wait who is this by? I want to find it so I can help
Where is Shelley's poem?
Please provide the poem.
Probably the setting will be in a castle. There will be an atmosphere of mystery and suspense. Most likely an ancient prophecy, and omens, portents, and visions. Also some supernatural events. Definitely overwrought emotion. Woman threatened by a powerful male most of the time. Gloom and horror too. That's about it.