Shit, sorry... I missed that one. It's actually important because you confuse these two things (structure and metphor; universal and particular) all the way through your argument.
The structure in this incidence is (a) binary (male:female - seaside:island-side) and (b) reflexive (as in, it can observe itself at work - in the guise of the anthropologist - some argue this is polluting). This is the Universal at work.
The metaphor is the singular case (male is to seaside as female is to island-side).
This is the confusion you're stumbling on times and again.
What Levi-Strauss and the Structuralists argue that metaphor and structure are inhernetly linked - but structure (binary, tertiary etc) comes first. Computer scientists would argue the same thing. Binary first - then code.
NB: my main response was posted prior to this and is awaiting moderation because its too long - sorry if this comes up first.