<a href="https://en.wikipedia.org/wiki/Rose_(mathematics)" class="extiw" title="w:Rose (mathematics)">Rose</a> crated with gears. 
The figures shape is determined by the gear ratio between the upper and the lower wheel.
<a href="//commons.wikimedia.org/wiki/User:Jahobr" title="User:Jahobr">Jahobr</a>
CC BY 1.0
<span class="int-own-work" lang="en">Own work</span>