Kamoi (鴨居) 

Shiki-i (敷居)

Kamoi refers to the upper part of a wooden frame that is grooved to fit fittings such as sliding doors (fusuma) and paper windows (shoji).
A shiki-i is the bottom part of a wooden frame with grooves to fit fittings such as sliding doors (fusuma)  and paper windows (shoji).

The Japanese tied on the kamoi when available and only started using bamboo as a replacement when one was not available.

 

By suggesting the presence of a sliding door, the kamoi also separates the space between the inside and the outside, if you are watching someone being tied on a tatami, you will often be separated from the scene, if you are watching form the next room, by the kamoi.

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