Marine position lights at a ship (<a href="https://en.wikipedia.org/wiki/Rhine-Herne_Canal" class="extiw" title="en:Rhine-Herne Canal">Rhine-Herne Canal</a>)
<a href="//commons.wikimedia.org/wiki/User:Arnoldius" title="User:Arnoldius">Arnold Paul</a>, derivative work <a href="//commons.wikimedia.org/wiki/User:L%C3%A4mpel" title="User:Lämpel">Lämpel</a>
CC BY-SA 3.0
<span class="int-own-work">Self-photographed</span>