you all need to see this

On roundabout just beyond the Canary Wharf estate there are three trees funded and produced by the Public Art Commissions Agency. Two are London planes; the third is a traffic light tree; Pierre Vivant’s eternal tree replaced another London plane as it was dying.
The arbitrary cycle of light changes are not supposed to mimic the seasonal rhythm of nature, but the restlessness of Canary Wharf.

http://en.wikipedia.org/wiki/Traffic_Light_tree