I'm thinking of something like an arch, but it doesn't have to be formed like an arch. The space shouldn't be long at all. I don't mean some sort of room between rooms. More like some hole or opening that acts like a segue between two rooms. For example, the hallway and the kitchen in an apartment. The opening is usually not so wide, either, I think. Two people might have to squeeze in to go through it simultaneously. I tried googling for pictures to help illustrate but uhh... not knowing the word made the effort unsuccessful. Any ideas?