These are sculptures from the basque sculptor Eduardo Chillida.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/51931594@N00">Jonny Hunter</a> from madison, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/51931594@N00/378225375/">Museo Chillida Leku</a>