CLOUD is a large-scale interactive installation by artists Caitlind r.c. Brown and Wayne Garrett that appeared September 15th as part of Nuit Blanche Calgary in Alberta, Canada. The piece is made from 1,000 working light bulbs on pull chains and an additional 5,000 made from donated burnt out lights donated by the public. Visitors to the installation could pull the chains causing the cloud to sort of shimmer and flicker.