As a metaphor windows have many meanings.And sayings too like
The eyes are the windows of the soul.
There is definitely a link between eyes and windows as symbols.We would not say
The ears are the windows of the soul
The ears are the doors of the soul.
Of course, soul has many meanings and some neuro-scientists and others don’t believe we even have a soul.But folk wisdom tells us more than science.You cannot prove most things by logic nor by scientific methodology.Neither can you disprove them.But your own life can reveal such things as the sacred and the soul’s longing for God.
The only problem is cleaning windows.Window cleaners here clean the outside and I confess I rarely clean inside!