Task
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Show off **your best scientific illustration** !

The main purpose of this question is to share beautiful scientific pictures, preferably with an educational aspect. 

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Content
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Your post must contain a nice picture and the associated code. One can post several pictures, but it must be done in different replies. Of course, it must be done with **LaTeX & Friends** : the post must start with a short sentence to present the language that you chose (TikZ, Asymptote ...) and the main packages that helped you to make the picture. Don't hesitate to add comments.

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Reward
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The satisfaction to share without expecting a reward :)

Ok ... 300 points reputation bounty for the best up-voted post until the 15th of Feb.

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Related links
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I'll contact [Texample.net](http://www.texample.net/tikz/) webmaster to see if he is interested to share the best illustrations, with the participant's agreement of course.

[Contest: Show Off Your Skillz in TeX & Friends](https://tex.stackexchange.com/questions/34482/contest-show-off-your-skillz-in-tex-friends-tex-sx-birthday)