You should divide the specific teaching content. If you demonstrate graphics, use cardboard. If you are in geometry such as intersecting lines, parallel triangles, etc. You can nail the battens with small nails. If it is in a plane coordinate system, you can also use two mutually perpendicular wooden strips to demonstrate the changes of the corresponding coordinates when the origin is determined at different positions. Very intuitive and vivid, and students are willing to participate. There are many more. Use your own brains, and there will always be a way.