caption: The image shows a poster with a picture of a bell and text that reads "Werklieden in Overheidsdienst de Stormklok Luidt - Organiseert u in den Modernen Bond van Werkliedeen in Overheidisdienst". The poster is likely advocating for the use of wind turbines in the modern world. The bell in the picture symbolizes the power of the wind turbine and the text serves as a reminder of the importance of the message it conveys.