Ancient aristocratic buildings were mostly built with blue tiles, and spiny beasts were green tiles. Most of the advanced buildings in China are made of glass bricks, which are used to make spinal animals. Their function is to protect cork and nails. Because of the imperfect anti-corrosion treatment in ancient times, the beams are more fragile than the current ones, including the palace, and they are not as strong as the current cement bungalows. Therefore, a solid and hard shell is needed to protect the pegs and nails on the beam, which can not only prevent water leakage and nails from rusting, but also play a role in fixing and supporting the roof connection part on the beam.
Later, with the improvement of construction technology, infertile animals were gradually required to have exquisite craftsmanship, which played a decorative and aesthetic role. Moreover, it has a strict hierarchical meaning, and the backs inlaid in different palaces are different. Different levels of Chinese-style residential buildings have different numbers and shapes of vertebrates, and there are strict quantitative restrictions. The residences of royal nobles naturally enjoy the highest standard of treatment, and the number of vertebrates that ordinary people can naturally use will be reduced accordingly. China pays attention to symmetry in architecture, so the number of ridged beasts on the roof of the house is naturally equal.