This exhibition of 26 panels, from the first industrial revolution to the first half of the 20th century, puts into perspective the complex questions surrounding the management of nature, its resources, but also its excesses, time and threats. These questions are of course intimately linked to the apprehension of risks and show that concerns do not date from today. Come and discover the risks faced by the Val-de-Marnais and how they could gradually take them into account and even anticipate them.