Activists placed hundreds of painted-red women's shoes on Mexico City's sun-drenched main square to call attention to gender-based violence in a country where, on average, 10 women and girls are murdered each day and less than 10% of those cases are ever solved. Mexican visual artist Elina Chauvet began using this form of performance-protest art in 2009 after her sister was killed by her husband in a domestic violence case. The shoes, according to Chavet, visualise absence and the red is for the blood that has been spilled.