This app provides basic geometry for cropping and splicing operations, allowing small explorers to freely use their imagination to arbitrarily crop geometric shapes to create a wide range of new shapes. Then, you can color the new shape separately. Finally, the color-filled shapes are spliced and restored to the original basic geometry. Through this process, a dynamic understanding of the geometry of the enlightened person is established. This app is designed to provide exploratory learning, allowing the enlightened to learn and explore, discover and summarize the rules through the process of self-test (cropping, coloring, assembling). Through hand-eye coordination, basic geometrical cognition is obtained, rather than learning through preaching, book experiments, and rote learning.