Hang a work of art the way the professionalsl do. This is the formula that professional picture hangers use:

1. Measure up 60 inches from the floor.
2. To this, add half the height of the framed picture.
3. Subtract the height of the wire. (The height of the triangle that the wire would form if the frames were actually hanging in place.)

This magic number is the distance from the floor at which you should the nail and picture hook regardless of the height of the ceiling or even your height.