The human body could be compared to a clock. Heartbeat, blinking, and breathing, the rhythmic functions of the autonomic nervous system, mark the passage of time. Sneaky Time is an interactive art installation using a quartz clock display and blink detection input. Sneaky Time reminds the participant of the passage of time and its connection to the human body. The quartz clock ticks when the participant blinks her eyes. In addition, Sneaky Time points out the relativity of time. When a clock is watched time seems to progress slowly. When we do not pay attention time sneaks by us. If a participant closes her eyes, the clock ticks ten times faster. The clock’s ticking sound is amplified so that the participant can perceive the response even though her eyes are closed.