The traffic light is actually a sculpture created by Frenchmen Pierre Vivant and was located on Westferry Road since 1998.  The quirky street art has 75 blinking light bulbs resembles a tree and can be confusing to unsuspecting visitors.

When I first saw it I was confused initially trying to figure out which signal to follow.  Unfortunately the sculpture was recently removed to make way for road improvements.  Hopefully, London will erect it again for everyone to enjoy!