For the many of us who don't have a "foyer," our apartments open right up into our living rooms, which can very quickly eliminate any sense of intimacy or privacy when spending time in the room. If you're looking right at the door, you can almost feel the energy getting sucked out of it. I designed a useful solution in a house in Brooklyn. It is basically a partition and can be used to divide any space (say a studio apartment for example). I used a bookcase from Ikea, and filled it with books. You can see the door just beyond it in the image. Anything would work in the bookcase though, including decorative bowls, vases, etc. The key is to create the suggestion of a barrier, even if it is not completely solid, and the mind fills in the blanks.