fluff is a floating luminous body composed of a balloon of 1.1m in diameter. It creates a dramatical space, changing the color and rhythm of its light according to sound and video screens. Most lighting systems we see in everyday life are fixed to architectural structures and light up the space they face from outside. What do we feel if we are in a space emitting light by itself from inside? In fluff, luminous bodies fly away from the walls like floating particles of air and emit lights from inside the space. The space is filled with light instead of being lit up from the surface. It is a new experience being immersed in luminous air.