A simple, colorful educational illustration for a primary school science lesson, in a flat, friendly cartoon style suitable for 7-8 year old children. The image shows a hanging mobile in the center: a horizontal bar suspended from a hook, with a small square weight hanging close to the center on one side and a small round weight hanging further out on the other side, connected by thin strings. Make it visually clear that the weights can slide left and right along the bar, rather than being fixed in place. Show this with small horizontal arrows (a double-headed arrow, or dashed motion lines) next to each hanging string, indicating that the weight and string can be moved closer to or further from the center. Around the mobile, in the four corners of the image, are four different children, each with a large, empty speech bubble pointing toward them (no text inside the bubbles). Leave generous empty white space inside each speech bubble, large enough to fit two to three lines of text that will be added afterward. Style: flat vector illustration, bright primary colors (blue, teal, coral, amber), simple rounded shapes, clean white background, no text anywhere in the image, child-friendly and inclusive character design, minimal shading, educational textbook illustration style similar to a "concept cartoon" used in science education. Mehr sehen