Inflatable barricade training for December 12, 2015 (D12). Inflatable barricade training for December 12(D12) . The word “barricade” comes from the French word “barrique” meaning “barrel”. The first barricades were hollow barrels rolled out into 16th century streets, filled with stones and secured with metal chains. Tools for Action developed a barricade with a similar construction principle. Modular lightweight sculptures made of insulation foil are filled with air and attached together with velcro. A set of cube-shaped units (like cobblestones) can be quickly inflated at different locations, forming a line that hinders sight and movement when brought together en masse. They can be more than walls though – when people throw the individual cobble- stones into the air, they turn a street into a spontaneous playground.