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"Zen Fluid Dynamics.Sit in a sunbeam in a dimly-lit room. Light a stick of incense, hold it vertically, then move it upwards and stop suddenly, with a jerk. A perfect smoke-ring will be launched from the burning tip. Move the incense upwards, then suddenly jerk downwards, then repeat. You can launch fast smoke-rings through the center of slow ones, create side-by side rows, etc. In a draft-free room they persist for ages, and soon the air will be full of huge grey thin circles. Contemplate the silent Chaos. "
This stuff is great. I love it.