Four <a href="https://en.wikipedia.org/wiki/simple:Earthquake_protector" class="extiw" title="w:simple:Earthquake protector">earthquake protectors</a> in process of assembly at the <a href="https://en.wikipedia.org/wiki/en:UCSD" class="extiw" title="w:en:UCSD">UCSD</a> outdoor testing facility.
<a href="//commons.wikimedia.org/wiki/User:Shustov" title="User:Shustov">Shustov</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>