Francis Alÿs: Ricochets; Anthony McCall: Solid Light – reviews

Barbican Art Gallery, London; Tate Modern, London
Mesmerising films documenting children’s play around the world dissolveborders and liberate our adult imagination, and there’s a ghostly thrill in the space where light meets drawingAn astonishing film opens this mesmerising exhibition. It shows a crowd of children in a parched and barren landscape at dusk, staring intently up at the sky. Above them swarm thousands of buzzing black dots. The children appear to mimic the sound, and eve