Beginningless #1: Sitting in the room in absolute silence.

Koan:

Seikenko of Cho composed a gatha as he was enlightened upon hearing thunder strike.
Sitting in the room in absolute silence.
Mind-source unmoved, filled like still water.
The striking of thunder has opened the gate of the head’s crown.
The beginningless self-nature has been awakened.
Present the implication or content of each line.

Absolute silence seems like a contradiction in terms. I look at the figure we (my cosmic assistant and I) drew and I look like I'm being electrocuted. I seemed to be hearing lots.

He asked how the study of the koans affected my sitting. Maybe here I could see myself so agitated—barely "sitting."