China's national design code stipulates that the number of outdoor steps is 3.
~ 19 step. People are used to walking left and right, ranging from three steps to nineteen steps. If there are many steps, it is necessary to design a rest platform so that people can rest on their backs, relieve fatigue and move on. The number of outdoor steps requires that Anyang residence must be odd, odd is yang and even is yin. If it is a temple building or a public building, it can also be designed and built in even numbers.
If it is made into three steps, people will feel easier, more comfortable and harmonious with the environment. If two steps are better, then choose two steps. But in ancient times, people paid more attention to geomantic omen. In religious temples and government offices, singular numbers were generally used. In folk, even numbers are generally used, because even numbers are folk luck.