What's the difference between ancient Lubanchi and modern rulers?

1 half a foot =0.8 city foot = 26.6667 cm.

Explained by modern science and technology theory, the door is similar to a microwave resonant cavity. Doors of different sizes have different resonance effects on microwaves of different bands, and microwaves of different bands have different effects on people's physiological functions and mental activities. This is very similar to the principle that the length of radio antenna has different reception effects for different radio bands. In ancient times, it was emphasized that the dark room in the bright hall and the windows were generally small, so the door was used as the air inlet, regardless of the air intake in the window. Some windows in modern layered houses are larger than doors, but the main entrance and exit doors are not often opened, so we should not only pay attention to the size of doors, but also consider the air intake function of windows (especially floor-to-ceiling windows). For doors and windows that are often opened, the size should be controlled so that the height and width of doors and windows (both refer to clearance) are controlled within the size of Kyrgyzstan. The floor ruler, also known as "quasi-floor ruler", is a measuring tool used in building houses and houses, similar to the bending ruler used by craftsmen today. Lu Banchi, about 42.9 cm long, is said to have been written by a public school in Lu during the Spring and Autumn Period. Later, eight characters were added to the geomantic circle to measure the good and bad luck of houses and houses, which was called "door plan". Its eight characters are: wealth, illness, divorce, righteousness, official, robbery, harm and capital. Under each word, it is divided into four small words to distinguish between good and bad.