classic waka stream

What is in the mind
of the lady who dyes them
I cannot make out,
yet surely it is the one
that changes that goes deeper

Meaning
What is in the mind of the lady who dyes them I cannot make out, yet surely it is the colour that changes that goes deeper.
Commentary
Part Three: Agemaki

 Oigimi's reply to his poem on the autumn leaves. She says that it is the changing colour that grows deep, hinting that his own heart will in time move to her sister. Her wish to see the younger married to him is plain in the answer.

 She takes his yamahime and "deeper colour" exactly as given and shifts the sense with the single word utsurou, which is both a colour changing and a heart turning elsewhere. Refusing him and recommending her sister are managed at once within one figure of two shades of red.
Author
Murasaki Shikibu
Source
Genji Monogatari
Other