Help me understanding assets path

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SOLVED! See:
https://railsforum.com/topic/1975-help-me-understanding-assets-path/

(Note: Since the question is still unsolved, I crossposted it at
https://railsforum.com/topic/1975-help-me-understanding-assets-path/)

I’ve put my favicon into app/assets/images and include in my header

<%= favicon_link_tag ‘my_favicon.jpg’ %>

The favicon is correctly recognized by the browser, so it works
perfectly. When viewing the source code, I see to my surprise that the
following HTML code is generated:

Aside from the MIME type (I had expected that rails would generate
image/jpeg), what really puzzles me is the path. The file is definitely
in /assets/images, not in /assets . How can the browser locate the file?