I am not a mathematician nor so on, but for example (don't know why) I've always considered very sexy the following things, for example:
http://align4profit.com/wp-content/uplo ... 00x274.jpg
http://i1-news.softpedia-static.com/ima ... ants-2.jpg
•Vortices inside Liquids
https://upload.wikimedia.org/wikipedia/ ... _water.jpg
Let me know yours, think and don't be shy!