Example of <a href="https://en.wikipedia.org/wiki/mustache_distortion" class="extiw" title="en:mustache distortion">mustache distortion</a>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Barrel_distortion.svg" title="File:Barrel distortion.svg">Barrel distortion.svg</a>:  <a href="//commons.wikimedia.org/wiki/User_talk:WolfWings" title="User talk:WolfWings">WolfWings</a></li>
<li>derivative work: —Nils von Barth <a href="//commons.wikimedia.org/wiki/User:Nbarth" title="User:Nbarth">nbarth</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Nbarth" title="User talk:Nbarth">talk</a>)</li>
<li>derivative work:  <a href="//commons.wikimedia.org/wiki/User_talk:WolfWings" title="User talk:WolfWings">WolfWings</a></li></ul>
<a href="//commons.wikimedia.org/wiki/File:Barrel_distortion.svg" title="File:Barrel distortion.svg">Barrel distortion.svg</a>