This <a href="https://en.wikipedia.org/wiki/Four-eyed_fish" class="extiw" title="en:Four-eyed fish">Four-eyed fish (Anableps anableps)</a> is swimming in streaming water over white and black sand. The streaming water shows colorfully reflection.
<a href="//commons.wikimedia.org/wiki/User:Michael_G%C3%A4bler" title="User:Michael Gäbler">Michael Gäbler</a>
CC BY 3.0
own work (eigene Arbeit)