Five coloured spotlights, directed at a white wall, are arranged in a line on the floor: a green light positioned next to another green light, followed by a magenta light, an orange light, and, nally, a blue light. These colours combine to illuminate the wall with a bright white light. When a visitor enters the space, her shadow appears on the wall as an array of five silhouettes, each with a different colour. Visitors’ shadows grow larger or smaller as they move closer to or further from the lights.⁠ ⁠ Video: ’Your uncertain shadow (colour)', 2010. Previously installed at Guggenheim Museum Bilbao in 2020; Courtesy: Thyssen-Bornemisza Art Contemporary Collection, Vienna (video: @museoguggenheim).