Call us boring and simple-minded, but before we saw the work of street artist Joshua Allen Harris we never once considered the artistic possibilities of subway exhaust. Using only tape and garbage bags, Harris creates giant inflatable animals that become animated when fastened to a sidewalk grate. Steven Psyllos caught up with Harris recently to discuss his older works (including a bear and a giraffe) and unveil a new beast that looks not unlike the Cloverfield monster. Video by Jonah Green