I think the opening scene of the movie is to show everything that is bright, serene and innocent and everything that is for show like the flowers in the first shot. I think the bugs represent the wildness and darkness of the underbelly of society. They represent the disease beneath. Disease could be that of the body like a heart attack or stroke or could be that of the soul being evil. They both can pull you into the darkness.
Let me know what you think
Metaphors in Blue Velvet
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