Concentric L is a floor lamp designed in 2016 by Rob Zinn for Marset. The lamp, which consists of circular, overlapping plates, is made of lacquered white metal. The backs of the plates are covered with vinyl in different colors. The visually striking lamp is very impressive when it is thin and sleek. The lamp's colors are subtle during the day, but when the lamp is turned on in the evening, the Concentric L becomes truly impressive and dynamic. The effect is almost hypnotic because of the colors and effects of the lamp.

The inspiration for the Concentric series came to Zinn when he travelled by plane. He saw how the sunlight shone into the plane, reflecting the bright colors of the passengers' clothes against the white interior of the aircraft. With the Concentric series, the designer aimed to highlight the interaction between light and reflection. The series also includes Concentric S and Concentric M. All of the lamps are available in a variety of colors.