Answer:
An easy, smooth, beautiful life.
Step-by-step explanation:
In this poem, the image of the crystal stair is used to convey the idea of an easy, smooth, beautiful life. This is because crystal stairs are not only beautiful, but they also represent an easy, safe way to move. Instead, the mother describes her life as a stair with tacks, splinters, boards torn up, dark and lacking carpet on the floor. These images convey the opposite image of the crystal stair, indicating that the speaker's life has been very difficult.