Cuban artist Tania Bruguera unveils installation at Tate Modern Cuban artist Tania Bruguera unveils her latest installation at Tate Modern's Turbine Hall, the first in a series of pieces focussing on the crisis in migration. The installation - which requires the participation of gallery visitors - is made from a heat-sensitive material which covers the portrait of a Syrian refugee. The portrait can only be revealed by people collectively touching the floor, and demonstrates the artist's belief that people must work together to solve society's problems. The name of the work changes daily and is an ever-increasing figure - the number of people who migrated from one country to another last year added to the number of migrant deaths recorded so far this year. IMAGES AND SOUNDBITES