Street Furniture Design The Pebble Street Lighting by Gizem Deniz Guneri The Pebble is a sculptural street lighting device, that also operates as seating-leaning furniture, with irregular pebble-like geometry. It recycles the sludge waste generated during the cutting of andesite stones. Andesite is the most widely used natural stone in the construction industry, which yields tons of waste that is significantly rarely reused. The Pebble uses the tactile qualities of the material and blends into the urban environment tectonics. It emits light from a slit.