Meditative experience is rhythmic. Each time we close our eyes to meditate, we are responding to a call to adventure. We encounter obstacles, allies, reversals, and crises; we discover new perceptions, and finally break through to fresh energy and emerge refreshed, with renewed resolve to live.

Look over at my bhairavatantra site for more about rhythms.

http://bhairavatantra.com/rhythms/60secondcycle.html