Final answer:
The excerpt contains personification, with the window 'catching' the sun's rays.
Step-by-step explanation:
The excerpt you provided is a line from a poem, and it contains a figure of speech called personification. Personification is when human characteristics are given to non-human objects or abstract ideas. In this case, the window 'catches' the sun's rays, which is a human action. This use of personification helps to create vivid imagery and capture the reader's attention.
Some other examples of personification in literature include phrases like 'the flowers danced in the wind' or 'the sun smiled down on us.'
So, in summary, the excerpt you shared contains the figure of speech of personification, where the casement (window) is described as catching the sun's beams.
Learn more about Personification