Magnifying glass with focus on paper. Text in the background is from the public domain work <a href="https://en.wikisource.org/wiki/de:Die_Baukunst,_11._Heft:08" class="extiw" title="s:de:Die Baukunst, 11. Heft:08"><i>Die Baukunst</i>, issue 11, page 8</a>, written by <a href="https://en.wikipedia.org/wiki/Max_Hasak" class="extiw" title="w:Max Hasak">Max Hasak</a>. Rendered with a development version of <i>Cycles</i> in <a href="https://en.wikipedia.org/wiki/Blender_(software)" class="extiw" title="w:Blender (software)">Blender</a>.
<a href="//commons.wikimedia.org/wiki/User:Niabot" title="User:Niabot">Niabot</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>