RAAAF, founded in 2006 by Ronald and Erik Rietveld, develops research strategic interventions at the intersection of science, art, and architecture. Architect Arna Mackic joined the Rietvelds in 2009, bringing her interest in cultural heritage. Among their projects are the celebrated installation Vacant NL at the Venice Architecture Biennale 2010, and Secret Operation 610, completed in 2013.