According to wikipedia, a pebble is a clast of rock with a particle size of 4 to 64 millimetres, it is known to come in various colors and sizes, with different harshness grades and have multiple usage purposes.
The idea to buy a sofa made from pebbles may seem strange, but Carlo have made a whole collection that looks really nice and not too uncomfortable. Carlo Showroom describe their Maluku Collection as “Proof that creativity has no boundaries, this innovative collection infuses pebble inlays into practical furnishings. Its surprising visual impact stimulates curiosity.”