Why is the sofa u-shaped? Can't the l-shaped one work?

The sofa should be arranged in a U-shape, and the U-shaped depression is the receiving position of geomantic omen, which can hide wind and gather gas. It is said that it is more advantageous than single-line arrangement. L-shaped ones are not as easy to accept as U-shaped ones, so U-shaped ones are better and it is more convenient to sit on the sofa and communicate.

-Friends circle