The gravitational whistler gives the marble ball a new push – enough to move it again across multiple levels. After installing the gravitational whistler, the metal part of the ball must be rotated upwards. When an incoming marble track then hits the gravitational whistler, the metal ball drops and propels the marble track forward with momentum. The modular and compatible pieces of the marble track are designed to stay in place, allowing children to focus on having fun. They promote spatial intelligence and understanding of fundamental physical concepts like acceleration and gravity. Whether with a manual or through free play, building a marble track stimulates functional memory and enhances analytical thinking skills. Additionally, we rely on an existing system to extend its lifespan in children's rooms. All 6 pieces and accessory elements of the gravitational whistler are compatible with common elements from other manufacturers and can be creatively combined with building blocks and existing thematic series. Like all products from Hubelino, the gravitational whistler accessory is manufactured in Germany according to the highest quality standards. Combine the gravitational whistler accessory with marble track construction sets!