From dark matter icebergs to seashells.

Well, it is not the dark matter I talked before and the icebergs are not the way we know them, but I like how they look like. See also the ferrofluids on the first picture of this link. And you'll be surprised that there is something in common between dark icebergs and seashells. They are both nanoengineered. The first ones are human engineered while the second ones are engineered by nature.

A video story of the analogy could be found if you click on "Nanotechnology 101" link on this page.