The first strike of the beater sets the metal vibrating, and the vibration is heard as a tone: the bigger and longer the element, the lower it sounds; the smaller, the higher. The child hears this rule before they can name it: the triangle rings high and short, the tubular bell low and long. Striking metal goes back about five thousand years - it began in Mesopotamia and China, when people learned to work copper and bronze, and the first bells rang in temples. The panel brings the same physics to the playground: strike, vibration, tone.
The panel stands outdoors all year round, so it has to withstand rain, frost and sun. The frame is galvanised and powder-coated, the instruments are made of metals that do not rust, and the fixings are stainless steel cable. There is no electronics, speaker or power supply here: the panel plays from the first strike, just the same in May as in January. The instruments sound loudly, so if residential buildings are right next door, the location is discussed with an adviser. The equipment is covered by a warranty. The manufacturer is EduPlayground, and the panel is made in Poland.
Each instrument has a different size, a different shape and a different tone - that is where the differences you hear straight away come from.