Clock inspired by the circadian rhythm, the internal process that regulates the sleep-wake cycle. These 24-hour rhythms are driven by the circadian clock, which is reset each day by the light and dark cycle of the sun. This process is important because it allows the body to repair itself and the brain to consolidate memories and process information.  

Sunlight and moonlight are represented by the contrast of black and white. In addition, the rotation of the clock handle represents the rotation of the Earth on its axis, which causes the change between day and night.