In a darkened space, hourglass-shaped O=O objects were arranged to interact with the movement of visitors. Motion sensors were embedded in each piece, triggering separately the flickering lights. Standing still for about a dozen seconds caused all lights to gradually extinguish, immersing the visitor in pitch-black surroundings. At Roodkapje Gallery and DordtYart Center, this effect was amplified by black-painted walls, black ceilings, and soft black carpeted floors. After remaining motionless in complete darkness, visitors’ eyes adjusted, and subsequent movement, reactivating the lights, could provoke an afterimage — an ephemeral imprint of the interplay between light and shadow, presence and absence.