Time: 30 minutes.

Situation: A quiet room with my eyes closed, sitting Burmese-style with my hands on my knees.

Experience: I closed my eyes and immediately perceived my visual field "vibrating" at about six to eight times per second. Concentration was high and vibrations were crisp and clear. Awareness shifted to my sense of touch and the "vibrations" sped-up. "Formations" were evident. Chanced into several of the "immaterial jhanas".

Observations: I got food poisoning today, so this session was . . . lets say, "cut short". Anyway, I didn't get a chance to write this blog entry until some time later, and most of my memory of the session is gone.