When a ferro-fluid is placed on top of a magnet, it
morphs into sharp peaks surrounded by shallow valleys. Highly
polarized outgoing photons are producing the peaks, while less
polarized incoming photons are producing the valleys.
Ferro-fluid
By Steve Jurvetson -
http://www.flickr.com/photos/jurvetson/136481113/, CC BY 2.0,
https://commons.wikimedia.org/w/index.php?curid=906519
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