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The bio-clock refers to the working of our inner clock or sense of time.
The basis of the drawing is a clock behind bars. The clock contains two faces in almost a mirror image, one differs slightly from the other. One has open eyes which represents the day while the other has closed eyes which stands for the night. The difference between the two faces is clearly visible when the drawing is rotated 180 degrees. That is also the reason why the clock in the day indicates that it is 12 o’clock in the afternoon and the clock in the night 12 o’clock midnight. Daytime is enhanced by the sun and the food. Night-time by the moon and the bed (night rest).