a mind slowly ripen on a sunny wall of experience?

[Jason Lee]

Seen thus, across the level tracery of the yews, under the suffused, mild light, it sent her, from its open windows and hospitably smoking chimneys, the look of some warm human presence, of a mind slowly ripened on a sunny wall of experience. She had never before had so deep a sense of her intimacy with it, such a conviction that its secrets were all beneficent, kept, as they said to children, "for one's good," so complete a trust in its power to gather up her life and Ned's into the harmonious pattern of the long, long story it sat there weaving in the sun.

It's from Edith Wharton's 'Afterward' of 1910.

Can you paraphrase 'a mind slowly ripened on a sunny wall of experience' in the paragraph?
Or explain the meaning of it more easy English? It is a bit too poetic for me.
(The protagonist is looking at her newly bought mansion in England. Ned is her husband.)

 

[emsr2d2]

@Jason Lee Please note that I've improved the layout of your post. When you're asking a question about someone else's words, here's the ideal layout:

1. Text
2. Source information
3. Your question

 

[BobK]

The 'mind slowly ripened' metaphor refers to fruit growing in a walled garden. In the Northern hemisphere it would be a south-facing wall; fruit growing next to that is encouraged to ripen by the warmth of the sun. In the metaphor, the mind is the fruit and the shiny wall is experience. The mind slowly ripens in the sense that it grows and becomes sweeter.