Flashback.....

Flashback is recollecting of the past or memories of the past.

Example:
    1. On certain ones I had not seen, for years past did I call

    (Paying Calls)

    The narrator is recalling about friends and their past life.

    2. I went to the Garden of Love.........
    .....where I used to play on the green


    (The Garden of Love)

    The poet recalls his past, the beautiful garden where he used to play earlier.