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The analogy of the circle is good, and it can be made in the form of a Roman column, or directly with a Roman column.
Roman columns are made of wood or plaster, depending on the situation.
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The living room is big enough to be empty, but it doesn't seem very depressing.
Take a look at the style of home decoration, the most important thing is the height of the room.
As long as it's convenient for you to move on your own time. Don't worry too much, because you don't dare to do anything.
Of course, the kitchen is the place to cook, and the living room is the place to entertain guests, if you don't understand, you can ask a professional designer, or buy your own polished floor tiles, or materials to go back to decorate.
You have to learn this for a year.
The finished product I buy now is generally 6mm, and I personally recommend using 8mm