What does rectangular mean when decribing a person?
The sentence is from a movie:

My mum was lovely, but not like other mums. There was something solid about her. Something rectangular, busy and unsentimental.

What does rectangular mean here?
Thank you :)

Question

What does rectangular mean when decribing a person?
The sentence is from a movie:

My mum was lovely, but not like other mums. There was something solid about her. Something rectangular, busy and unsentimental.

What does rectangular mean here?
Thank you :)

Answer

I wouldn't say it's a common word used to describe someone in speech but here, I think it is being used metaphorically. From the context, I think it means that the mother is very strict, emotionless, and strong, similar to the shape of a rectangular which is very rigid, solid, and straightforward.