The bellows of a articulated bus (Mercedes-Benz O 405 GN2)
<a href="//commons.wikimedia.org/wiki/User:LosHawlos" title="User:LosHawlos">LosHawlos</a>
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/User:LosHawlos" title="User:LosHawlos">LosHawlos</a>, taken <a href="//commons.wikimedia.org/wiki/Mannheim" title="Mannheim">Mannheim</a>, <a href="//commons.wikimedia.org/wiki/Germany" class="mw-redirect" title="Germany">Germany</a>