Did you know that stones can ring like bells? There are even stone xylophones, here you can see/hear how ancient stones can be used musically. These are not stones that we have made in recent times though so if you are planning on making one I could not tell you where to begin. Additionally stones can be made to levitate with sound, see here . We think of the Stone Age as a time when civilization was less advanced, simply because the evidence we see today doesn’t look like more than stones. Well my stone can ring, and levitate with sound, what can yours do? Still think slaves were used to build the Egyptian pyramids?