Wringing Heraclitus

When I wring out my washed clothes, I use a contra-motion, turning the cloth of the garment against itself to squeeze out the moisture. this reminds me that in Heraclitus there is a description of the harmonious sounds produced by a lyre through a kind of contra-tension between the wood and the strings, as it were, pulling against each-other, in a kind of conflict from which the instrument's beauty appears. I'll try to find the quote.