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Usually the function is to shade the clouds but is not sure of this because the "CLOUD" is an interactive installation by artist Caitlind rc Brown, formed by 6000 light bulbs, light source is!
It works because of people who surround and each part in its lighting when the pull cord to connect or turn off the light, the funniest part is that it never sees the lamp cord which is already connected ...
One way of fun together ...
What do you think of this cloud lit?
images not mine