“Sleep” is an outdoor installation that consists of a global jungle, a tricycle, and a sand castle. Bright balloons connected to the equipment gently inflate and deflate as if they are breathing, and its lights flicker in a slow constant rhythm, suggesting the subtlety of life. The soft sounds of piano and a daytime playground are reminiscent of the youth’s presence and vitality. The work alludes to the absence of children in parks due to the decreasing birthrate and change in how they play.