What is the theme in The Constellation Orion by Ted Kooser?

Imagination is another theme in the poem. "The Constellation Orion" is an act of imagination. It also describes an imaginative act: that is, the speaker having a conversation with the stars, as well as with his sleeping son. Although some critics consider Kooser to be a realist, he is, in fact, a romantic. Before the Romantics, poetry was considered an art designed to mirror human activity. Good poetry also mirrored, or modeled itself after great poetry of the past, specifically poetry of ancient Greece and Rome.