Yangyu butterfly pattern
<a href="//commons.wikimedia.org/wiki/Special:Contributions/J%C3%BAlio_Reis" title="Special:Contributions/Júlio Reis">Júlio Reis</a> and  <a href="//commons.wikimedia.org/wiki/User_talk:Misogi" title="User talk:Misogi">Misogi</a>
CC BY-SA 3.0
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Ageha01.jpg" title="File:Ageha01.jpg">Ageha01.jpg</a> <i>by</i> <a href="//commons.wikimedia.org/w/index.php?title=User:Misogi&amp;action=edit&amp;redlink=1" class="new" title="User:Misogi (page does not exist)">Misogi</a>