#23 has a very interesting idea--lighter coloured on one side, darker on the other. It suggests that people can enter the NewBack program weak or fragile, and leave stronger and more solid. I like this. To extend that concept, I wonder if the butterfly shapes could represent a weak posture on the left side, and a strong posture on the right side... like a chair pose or mountain pose in yoga. Can you change these shapes slightly to look more like a silhouette of a person in a specific posture?