Airport Art

This was hanging on a wall in San Francisco airport.  No explanation or any information about the artist, so I guess we're all left to guess what it means.  

It was a short visit to San Francisco and I always hate to leave my son, but it's not that far away that I can't visit often.  Headed home to Bellingham today.  Lizzie should be happy to see me, although she is quite in love with her cat sitter so at least she won't be grumpy.