"万花尺"在中文中通常指的是一种传统的中国乐器，它也被称为"万花筒"。(rules")is a drawing tool composed of an outer pattern board and an inner circular pattern board. The inner circular pattern board, which resembles a gear with irregular pen holes, has a large circular hole in the outer pattern board. The inner circular board is placed in the circular hole of the outer pattern board and rotates around the circle, allowing you to draw regular patterns like flowers by using a pencil or ballpoint pen from the pen holes. The patterns drawn by the Wanhua Chai are related to the radius of the outer pattern board circle, the radius of the inner circular pattern board, and the position of the pen holes.

When painting, place the child ruler inside the inner ring of the mother ruler, insert the gear teeth, and insert the tip of the pen into the small hole of the child ruler. Use the pen to drive the child ruler along the inner gear of the mother ruler to make circular motion repeatedly. During the painting process, the inner and outer teeth of both should always be in contact. After completion, a miraculous beautiful flower will be left on the paper. The very small displacement of the small hole on the child ruler will cause a great change in the pattern type. There are many changes in the shape of the child ruler, in addition to circular, there are oval, arc-sided triangles, cross shapes, plum blossom shapes, squares, polygons, and so on. The changes of the mother ruler are not large, but some of the outer edges of the mother ruler also have gears. When the child ruler is placed on the outer edge of the mother ruler to make a circular motion, the pattern drawn is a flower circle. The inner ring of the mother ruler is usually circular and oval. The patterns drawn by the Wanhua Chie are breathtakingly beautiful. The patterns created by arranging and combining different sizes and shapes of sub-scales or mother scales are even more diverse: they can be drawn alone, stacked, or joined. The size is 9CM * 5.4CM.