Adding built-ins around fire-place and a round table in the center of the space? This is a wall of windows instead of a fireplace with windows around, but similar layout-wise.
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Just flip flop the windows to the other side to visualize. I believe your room would be a couple of feet narrower.
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Vaulted Ceiling makes room feel much larger
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Windows on one side, TV at the end. Doesn't have to be another fireplace.
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This room if the built-ins on the left were windows instead?
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This room looks similar to the addition you proposed in terms of dimensions. It looks like a wide angle lens.
Layout?
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