Round straw bales.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/31195974@N05">JUAN RAMON RODRIGUEZ SOSA</a>
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/31195974@N05/4960143634">Campos de girasol de Burgos</a>