The Clearance:

1. The act or process of clearing.
2. A space cleared: The house stood in a clearance among the trees.
3. Machinery. A space between two moving parts, left to avoid clashing or to permit relatively free motion.
4. A formal authorization permitting access to classified information, documents etc.
5. Permission for an aircraft, ship, or other vehicle to proceed, as after an inspection of equipment or cargo.
6. Official certification of blamelessness, trustworthiness or suitability.

Installation, 2008, 4 x 4,6 x 5 m