There's something inherently more formal about a vertical painting — it draws the eye upward the way a doorway or a column does, adding a bit of quiet architecture to a room that might otherwise feel low and flat. A long vertical wall art piece works especially well in hallways and stairwells, where people move past it at an angle rather than standing still in front of it.
For bigger statements, large vertical wall art holds its own beside a tall bookshelf or a floor lamp, matching height with height instead of competing with it. Every piece carries the same heavy, textured brushwork — richer up close, striking from across the room.