Rainbow circle looks like spring, with rich colors and looks like a rainbow from a distance. This toy can exercise people's eye-hand coordination ability (as small as 3-year-old children, as large as the elderly); You can also change a variety of ways of playing and exercise your innovative ability. In the workshop, many fans hold competitive games and become educational toys suitable for all ages and widely circulated.

Source:

1943, when richard james, an American naval engineer and colleague, did an experiment in a shipyard in Philadelphia, he chose a spring with excellent elasticity in order to develop the best anti-strong wave components. Unexpectedly, during the experiment, Chad James accidentally knocked off a spring, and the spring slowly "walked" down from the shelf with the help of elasticity.

Therefore, the high quality elasticity of the spring attracted the attention of Chad James. He took the spring home and showed the mystery of elasticity to his clever wife Betty. But I never imagined that in the process of developing the mystery of spring elasticity, Betty turned the spring into a toy. This is the original rainbow circle.