The method of flattening the back of the Five Emperors' head with ordinary building boards is

1. First, determine the shape and size of the head and back of the Five Emperors you want to build. . Designs can be sketched on paper to better plan and organize the blocks.

2. Use appropriate building boards as the foundation. Choose a flat or rectangular wooden board of appropriate size as the base of your head and back.

3. According to the shape of the head and back, use building blocks of different shapes and sizes to build an outline. You can use building blocks of various shapes such as rectangles, squares, triangles, etc. to achieve the desired shape.

4. Pay attention to maintaining stability and balance. During the building process, make sure the bricks are firmly connected to maintain the stability of the entire structure. Suitable connection methods, such as latches, magnetic connections, etc., can be used to strengthen the connection between the building blocks.