Photo of birch veneer with two holes shot with a 40W CO2 laser. A 10 euro cent coin is placed next to  the test specimen to better understand the size of the small holes.
<a href="//commons.wikimedia.org/w/index.php?title=Maido_Merisalu&amp;action=edit&amp;redlink=1" class="new" title="Maido Merisalu (page does not exist)">Maido Merisalu</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>