The poet of the poem "Childhood" is Markus Natten.

Markus Natten was a Norwegian poet and writer who was born on September 4, 1925, in Oslo, Norway. He studied at the University of Oslo and later worked as a journalist and editor. Natten is known for his introspective and reflective poetry that often explores themes of human experiences and emotions.

Summary of the poem "Childhood":
The poem "Childhood" is a nostalgic reflection on the innocence and joy of childhood. It portrays the poet's longing for the simplicity and carefree nature of his early years. The poem begins with the poet reminiscing about the days when he used to play with his friends in the park, running and laughing without any worries. He describes the park as a place of freedom, where he was able to experience the world with a sense of wonder and curiosity.

The poet then contrasts his current adult life, filled with responsibilities and worries, with the blissful ignorance of childhood. He laments the loss of innocence and the burden of knowledge that comes with growing up. He reflects on how the passage of time has changed his perspective and made him realize the preciousness of those childhood moments.

The poem ends on a bittersweet note, as the poet acknowledges that he can never fully return to the innocence of his childhood. However, he still cherishes those memories and finds solace in the nostalgia they bring.

Themes in the poem "Childhood":
1. Innocence and joy: The poem celebrates the carefree and innocent nature of childhood, highlighting the joy and wonder experienced during that period.
2. Nostalgia: The poet reflects on his past and longs for the simplicity of his childhood, emphasizing the nostalgic tone of the poem.
3. Loss and change: The poem explores the theme of loss, as the poet recognizes the changes that come with growing up and the loss of innocence.

Key poetic devices and language:
1. Imagery: The poet uses vivid imagery to evoke the memories and emotions associated with childhood.
2. Simile: The poem includes similes to compare the poet's current adult life with the freedom and joy of his childhood.
3. Repetition: The poet repeats certain phrases and lines to emphasize their significance and create a rhythmic effect.
4. Tone: The tone of the poem is nostalgic and reflective, conveying the poet's longing for the past.
5. Metaphor: The poet uses metaphoric language to convey the contrast between childhood and adulthood.

Overall, Markus Natten's poem "Childhood" beautifully captures the essence of childhood and evokes a sense of nostalgia and longing for the innocence and joy that comes with it.