Egon Möller-Nielsen´s <i>The Egg</i> (<i>Ägget</i>), Stockholm, Sweden
<a href="//commons.wikimedia.org/wiki/User:Boberger" title="User:Boberger">Boberger</a>. Photo: Bengt Oberger
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>