A laser is installed in a designated smoking area in Shibuya Tokyo. Users interact with the installation through the gesture of smoking. By exhaling smoke, the user disperses a light diffuser that causes a flat red line to appear in mid-air. The more smokers there are in the area the stronger the flatline will appear.

A minimal, user-interactive, art installation, "Flatline" directly represents a medical flatline, drawing itspatially in mid-air with a laser and through the action of smoking. (Special thanks to Kanae and Yuko)