I purchased my first Puka Puka Design mobile over a year ago. It now appears above my workspace. I am drawn to mobiles and couldn't resist this new one for Otis's room. The Bird Mobile. All of the Puka mobiles have this air of sophistication that I love. 

The Montessori theory is that mobiles like these should represent reality. Animals that swim or fly are popular such as the Whale or Butterfly mobiles from Michael Olaf. Michael Olaf state that mobiles should have no more than 5 objects and they should be real, such as butterflies, birds, or fish—things that move through the air or water.

I think that makes the Bird Mobile perfect.