It is only with the heart that one can see rightly. What is essential is invisible to the eye.
Antoine de Saint Exupery
Imagine your bones are like tiny, light boats bobbing up and down on the current of your breathing.
Donna Farhi YOGA MIND BODY & SPIRIT 'Letting the Breath Move You'
...the 8 factors (limbs) of Patanjali's Yoga could usefully be arranged in a circle since it is by their combined power that the yogin propels himself forward along the path of internalisation.
George Feuerstein THE YOGA SUTRA OF PATANJALI 'The Eightfold Yoga'