Photo: Gilberto Esparza What if an army of mobile robots could transform polluted water into plant life? Tracing a fine line between robot and plant, art project and self-sustaining mini-ecosystem machine, Mexican artist Gilberto Esparza's hybrid creation "Nomadic Plants" (Plantas Nomadas) is a quirky contraption that actively seeks polluted water to feed the vegetation and microorganisms living symbiotically inside its body...