Underside of a fallen <a href="https://en.wikipedia.org/wiki/Trema_orientalis" class="extiw" title="w:Trema orientalis">Trema orientalis</a> leaf, central Taiwan hills. We note the
<dl><dt>two holes at top</dt>
<dd>eyes</dd>
<dt>middle hole</dt>
<dd>nose</dd>
<dt>lower hole</dt>
<dd>mouth</dd></dl>
No, we don't know what made the holes.
<a href="//commons.wikimedia.org/wiki/User:Jidanni" title="User:Jidanni">Jidanni</a>
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<span class="int-own-work" lang="en">Own work</span>