Because so often I'm either asked this question or hear people frustrated about it, I thought I would take a quick moment to refresh the correct procedure for hanging artwork.  This is particularly helpful when hanging artwork side by side.....

Artwork generally should be hung at approximately 60" to center (I also have read/heard 65" frequently).  Generally speaking it is at eye level for most people. 

• Measure the height of your artwork.  For our example we are going to choose 32" tall.
• Divide this number in half to determine your center point.  This makes it 16"
• Add the inches to your predetermined number - 60 + 16 = 76"  This is where the top of the art will be.
• Measure the distance from the wire to the top of the frame.  (make sure you pull the measuring tape up as if you were hanging the picture from it so that it is taught)  Let's say 4" for easy math
• Subtract distance from wire (or saw tooth) from the new number... 76 - 4 = 72"  This is where you make your mark on the wall
• Hang your picture hook with the bottom of it (where the wire actually hangs from) on the mark.
• (I find it easier for future use if you write your basic number on the back of the artwork - you'll do less math over the life of your work.

When hanging artwork over a chair rail, piece of furniture or other anchoring point, it should be approximately 6"-9" above it.

• The same basic steps as above, but instead of 60" (or 65") you'll use the 6" - 9" number to add to the half the height of your artwork. 
• The rest of the steps are the same.

To know how far apart to hang your art, let the frame or matting be your guide.  Using the width of one of these will be balanced to the eye.  It should always work for whatever art you are hanging as it will always be to the proper scale.

Happy hanging!!