Oil drop (on a street) and interference color. Size  about 30x30 cm².
<a href="//commons.wikimedia.org/w/index.php?title=User:Anaton&amp;action=edit&amp;redlink=1" class="new" title="User:Anaton (page does not exist)">Anton</a>
CC BY 2.0
<span class="int-own-work" lang="en">Own work</span> (<a href="https://de.wikipedia.org/wiki/User:Anaton" class="extiw" title="de:User:Anaton">Anton</a>)