Graffiti artists work through the night to repaint eight telephone booths . Latest in series of Baymax-themed stunts as character craze sweeps China . Artists wanted to help burned-out Beijing residents feel less stressed .
Graffiti artists work through the night to repaint 30 telephone booths . Latest in series of Baymax-themed stunts as character craze sweeps China . Artists wanted to help burned-out Beijing residents feel less stressed .