Some lone wanderer is out on these rocks, treading with cautious step the wet, wild seaweed; glancing down into hollows where the brine lies fathoms deep and emerald clear, and seeing there wilder and stranger and huger vegetation than is found on land, with treasure of shells--some green, some purple, some pearly--clustered in the curls of the snaky plants. 
Some lone wanderer is out on these rocks, treading cautiously. 