Final answer:
The sentences 'I just stare at the bright white moon. I saw Mum’s face' use a metaphor, which is a direct comparison without using 'like' or 'as'.
Step-by-step explanation:
The sentences 'I just stare at the bright white moon. I saw Mum’s face' employ the literary device known as a metaphor. A metaphor is a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable, without using 'like' or 'as'. In this case, the moon being compared directly to the mother's face. There is no literal similarity between the moon and a face, but rather the comparison creates a symbolic meaning, suggesting a resemblance in the speaker's mind or evoking the feeling of comfort, warmth, or beauty that the speaker associates with both the moon and their mother's face.