SuperRare

traffic light tree
 This work is a traffic light tree created by artist Pierre Vivant.  From 75 sets of traffic lights, the shape of a tree is made, which is one of the natural landscapes of London, these lights beautifully show the endless rhythm of the city.  This work was created in 1998 on Eron Kwai Bang Street, which shows the hustle and bustle of the city.

It sounds like you're describing a dynamic light installation or perhaps a traffic light system that deviates from traditional patterns