Why is gender always said to be the shape of a box?

Ok moving further on with what Louise said, I have a question about the metaphor and meaning behind gender "shapes". A good question for Louise or anyone else that wants to answer.

6)  why is gender always the shape of a box?

Sometimes it is shown as a sphere.

Not that the shape is important, rather I am talking about the metaphor and the meaning behind the shape. Is the word "box" used to denote a prison or entrapment? And what assumptions lead to believe that constructs are always boxes? And that people are forced into these boxes which others have been created.

What happens if Social constructs are not looked upon as being just a box, rather a more fluid like amoeba or sphere metaphorically speaking. And is more self constructed or self determined. Does how one talks about even the shape of gender influence one's opinion about what gender is?

Just wondering why social constructs have to mean boxes and binary, with negative connotations.

If one's social construct is to not live by social gender norms, would still create a rule, or rules to live by. The rule being not to limit oneself to other's definitions.

Comment about question 4
As for being fundamentally biological, there is no real evidence that gender identity is determined by biology yet. The closest being the studies on hypothalamus region and neurons in that region.

Certainly one doesnt really choose to have gender identity issues. Rather the choice is in being aware, learning more about it, and what to do once one is aware of it.