This is a reference clone of the Ari theme for wordpress.com (ari-wpcom), which is a modified version of the original Ari theme by Elmastudio.
The original theme can be found at http://www.elmastudio.de/wordpress-themes/ari/
The wpcom version can be found at https://wpcom-themes.svn.automattic.com/ari/
Both licensed under GPL v2