I passed by this artwork on the Parvis at La Défense (the Parisien version of Wall Street or the City of London). I found the juxtaposition between the green and the glittering lights of the high rise blocks. The artwork was part of a series in 4 major cities in France - Paris, Lille, Marseille and Lyon, organised to celebrate the International year of Chemistry.
The artwork is called Le recyclage : « Rosae Plasticae » de Marie-Hélène Richard
This is her website; http://www.mhr-artinsitu.com/jardin.html and interestingly she creates art for gardens, there are some very interesting pieces on her website, it's well worth a look.
Her work was a breath of fresh air and an interesting addition to the city landscape.