black gabbro stone prism. it stands in the park and is bevelled and polished. if it gets wet, can play various sound melodies and

beveled bevelled black can clean column concrete cracked cristal cube cut education finger fingers floor flooring gabbro geo geology gets grid gutter hand hard icing logo melodies melody music musical natural park play playground polish polished press pressing prism pushing rubbing school shape smooth snow sound square stands stone stonemason stripe tiles tone tones town various vertical vertically vibration water wet xylophone yard your