The poet addresses the nightingale and talks to the bird throughout the poem. What is this kind of poem called?
In the whole poem, an author was addressing nightingale and was praising her immortal voice and was even talking to her in the whole poem as he was in the stage of abstraction which had taken him to unreality and he was happy with it because he forgot all those unpleasant aspects of human life. So, this poem is based on abstraction.