I will be looking at the use of the moon by Archibald Macleish in his poem ‘Ars Poetica’. The second verse of this poem talks about the moon in every line and even repeats the line “A poem should be motionless in time As the moon climbs,” twice in the verse. I think Macleish has used the moon to help define his understanding of what exactly poetry means to him. Macleish believes that poetry is something that should be universal and pure of creation. He uses the moon in similes throughout the second verse to talk about this idea. “A poem should be motionless in time” talks about the universality of poetry. Macleish believes that poetry should be an emotional extension of the writer as emotions are universal. Anyone, anywhere, at any time should be able to understand the emotions being conveyed in a poem. The poet also talks about the cycles of the moon and how we do not see the moon change during these cycles. This is a further exploration of the purity of human emotions and how we do not need to be aware of them for them to exist.