This is a picture of a propeller blade from the cold-war era P-2 Neptune patrol aircraft. This propeller is leaning against a wall. I made this animated GIF by compiling 47 pictures of individual prints of this particular image.
<a href="//commons.wikimedia.org/w/index.php?title=User:Raphaelgriswold&amp;action=edit&amp;redlink=1" class="new" title="User:Raphaelgriswold (page does not exist)">Raphael Griswold</a>
<span class="int-own-work" lang="en">Own work</span>