Francis Alÿs: Ricochets review – children of the world unite in a health and safety nightmare

Barbican, London
From Cuba to Mexico, from Hong Kong to Iraq, the Belgian artist has made 40 mesmerising films of kids at play, including three with guns up to no good in a war zoneCries and laughter, clapping and calls and screams of delight fill the gallery. There are children everywhere on the multiple screens that fill the lower floor. Kids in Cuba careen round the streets of Havana on precarious trolleys fashioned from bits of wood and discarded junk. They rattle and slew on cobbles and jin