magic square on the <a href="//commons.wikimedia.org/wiki/Sagrada_Familia" class="mw-redirect" title="Sagrada Familia">Sagrada Familia</a>
<a href="//commons.wikimedia.org/wiki/User:Oscar" title="User:Oscar">Oscar</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>