Ciel (2003) 

Commissioned for the Brussels headquarters of Belgacom (now Proximus), A camera is fixed to the top of a telecommunications company’s tower, an area accessible only to executives. It films the sky day and night. The images are instantly transmitted and projected onto a wall in the main corridor of the ground floor, accessible to the building’s 7,000 employees. The framing is oriented toward the sky at the eastern horizon. This is the sky of Brussels in Antwerp.

Aerogel (2000 – 2025)

Composed of 99.5–99.9% air, it weighs almost nothing. It is the lightest material ever created. The aerogel is translucent, like a fragment of fog. Natural light passing through it colors it in the same way as light crossing the layers of the atmosphere—sometimes slightly bluish, sometimes slightly yellow—like a sunrise or a sunset.
The aerogel is simply placed there in a display case, to protect its extremely fragile existence.
It is an attempt to exhibit almost nothing.