How does Gary Snyder use imagery in True Night?

Similes are prevalent in the poem, True Night. When the raccoon noise awakens the man, for example, his "mind rises up to a fact like a fish to a hook." Obviously a mind cannot be caught on a hook but the visual imagery is a descriptive way to say that the man is abruptly awakened once he senses the initial disturbance. An especially vibrant use of simile is the author's description of his blowing hair as "a dandelion head gone to seed about to be blown all away." There should be no doubt as to the image he has in his head of his unruly appearance in the night.