There is a time and a place for everything, and in my line of work I see a lot of people staggering around the room when they ought to be on the level.
I'm talking about hanging artwork, by the way.
You can tell the amateur designer from the pro very easily by simply noticing how they hang artwork. There are rules that, especially when staging, one should not take liberties with. Stagers endeavor to exhalt the architecture, not to fight with it or detract.
Hang artwork on the level when the floors, walls, ceiling, and mouldings are also level.
The time to stagger pictures on a diagonal line is when the sightline of the architecture is also inclined, such as would be seen on a staircase wall.
Following the sightlines is one of the best FREE ways to improve the photogenic qualities a space can offer and to reinforce the idea and value of lifestyle upgrade by encouraging an overall harmonious and tranquil "vibe."
A stager's job is to make sense of the space, and the artwork placement is a superb and easy way to bring an instant sense of order to any home.