When You Say You're Sailing, Don't Use A Speedboat

Coasts and harbours
Are one and the same
But they each mean
Something different

Two words in a book
On a page, side by side, unique

Walk to the harbour
Oar up to the coast
Roaring past simile similarly
Dive into spaces
Stuck in between

Swim underneath
Illogical green
Lost in frilly fishnets
Lingering still
You search for the right of way