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If you hang the painting in the center of the living room, there is no need to have a distance between the paintings, just next to each other.
If you have to leave a distance because the space is too large, you must also leave a distance according to the actual situation, and there is no fixed number.
Don't use the whole wall, according to the size of the sofa or smaller than the size of the hair will be coordinated.
It is possible not to place the spacing in the upper middle position.
My sofa rice, the physical store recommends 60 80 triptych paintings, just right, the store is installed at the door, it is recommended that you can change it to a larger size. This one is really small, and it doesn't seem to be atmospheric.
I suggest you refer to the following.
Octave space ornamental painting. >>>More
What is a triptych? The living room is generally a central hall, plus a couplet.