We need artists like Minerva Cuevas. The Mexican conceptualist and provocateur makes objects and installations exposing the pervasive control that corporations and cartels — and governments and religious institutions — exercise over our lives. She’s a cultural vandal who doesn’t descecrate; she illuminates. Her nonprofit Mejor Vida Corporation engages in all sorts of mischief (printing authentic looking student ID cards and retail bar codes) that seeks to redress the growing gap between Haves and the everyone else. Cuevas makes the most difficult kind of art: stuff that matters.