由加拿大藝術家Caitlind rc Brown設計的“CLOUD”是由 6000 顆燈泡（1,000 顆可亮燈泡，5,000顆回收燈泡）構成的互動燈光裝置藝術，一個巨大雲朵，隨著觀眾拉下代表雨絲的拉繩開關產生的時間差，“CLOUD”閃爍有如穀雨時節的雨雲騷動。
CLOUD is a large scale interactive installation by artist Caitlind r.c. Brown that appeared September 15th as part of Nuit Blanche Calgary in Alberta, Canada. The piece is made from 1,000 working lightbulbs on pullchains 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.