Erik Barray offers visitors a kilometre-long stroll along the left bank of the river starting at Pont Morand. Glow-in-the-dark insects flit along the plane-tree lined avenue. Swarms of bugs in the branches of the trees generate a warm orange light flickering like the delicate flame of hundreds of candles. Down on the banks of the river, beneath the Pont de Lattre de Tassigny, the tunnel has been colonised by dozens of strange illuminated creatures. As the visitors wander along, they come across delightful illuminated cocoons opening up to release a myriad of multicoloured butterflies. The stroll ends near Pont Churchill, culminating in a flight of sparkling fireflies against a backdrop of blue greenery, seeming to point the visitor in the direction of the Parc de la Tête d’Or.