"plain space" is correct and usable in written English.
You can use it when referring to an area or region that is unornamented, open, or simply empty. For example: "We decided to keep the wall plain, leaving a plain space between the two paintings."
Even so, not every interior should be a plain space with nothing but the natural walls.
A grade-II-listed Victorian building, the main bar is a suitably plain space.
The evidence is plain: space for fiction in general-interest high-circulation publications is shrinking.
Other physicists speculate that our universe could mutate from space-time to just plain space.
A group of designers are seeking inspiration from the spare, pondering the infinite in plain space, spurring the mind to soar heavenward untrammeled by the weight of embellishment.
The outfits are left to speak for themselves, as art objects often lighted by a streak of color at the back of a plain space.
Making the house like a gallery was intentional, says Quinn. "I like white, plain spaces.
In the end Judd would have to build Marfa to ever be so complete again, stripping down the buildings, setting out his extraordinary collections of art and furniture, filling an airplane hangar with his library, establishing the impeccably plain spaces for the works of his favored cohorts.
Shopping online, Ms. Salk found several sets of sheets and duvets from West Elm and CB2 that she thought would give the plainest space a sense of personality.
Let I i be the ith plain (color space) of the image (e.g., Red color component from the "RGB" color space), where i = 1,2,3.
There's a refreshing scarcity of supporting material and plenty of plain, empty space.
