In the Book of Changes, numbers are divided into positive and negative numbers, odd and even numbers, day and earth. One, three, five, seven and nine are odd numbers, positive numbers and days; And two, four, six, eight and ten are even numbers, that is, the number of yin and the number of places. In ancient geomantic omen, Yin and Yang were divided, in which Yang Zhai was a house where people lived and Yin Zhai was a house where the dead lived, which was unlucky. Therefore, yin and yang and five elements are traditionally respected, so buildings are also carried out according to this principle, so almost all the steps of ancient houses are singular. It continues the tradition left by our ancestors, so the stairs and steps of modern buildings are generally odd, that is, odd. Generally speaking, the number of stairs is based on the words "life, glory, death and despair", and the steps on the platform must be based on life or glory.
But in fact, from a scientific point of view, whether the steps are even or odd depends mainly on the height of the floor and the height of a single step. Because the height and other dimensions of the steps have their own scope of application, when determining whether the steps are odd or even, they will be affected by the difference of story height and specific standards.