It is a novel way to get more people interested in water management and sustainable development.
An international expo has opened in Zaragoza in Spain, with 25 hectares of displays by more than 100 different countries.
Ironically, heavy rain and flooding threatened to cause problems at the expo, but organisers say they are now ready for the public. They are calling it the biggest water festival on earth.
The expo will be open to the public for three months, and one of the aims was to make many of the attractions interactive.
Climate change and the lack of clean water in developing countries are just some of the subjects to be tackled in the displays.