The wonder of discovery and adventure evolves as the poem unfolds, word by word. Different sounds, colors and forms provoke emotions. A poet need never directly tell how sad, romantic, mystical or joyous the poem is. It will be the reader who makes the final revelations, through the emotional, descriptive words.
Poetry is a source of emotion.
It is joy and pain - fear and confidence. It is a transformation amongst all feelings. Tears and smiles through words that come from the poet will often manifest themselves in the reader. One reads poetry with one's nerves. It may not always be interpreted exactly the same way.