Time is an abstract perception of material movement. One afternoon on the side of the road, the shadow of the street lamp moved, also revealing that a period of time has quietly passed away. The "Shadow of Time" timer pointer is made into the "shadow" of the cylinder and rotates around the cylinder for one hour. In daily life, we will not always pay attention to the timer. When we pay attention to the timer again, we can know the approximate time consumed and feel the casual passage of time in a familiar way through the change of the position of the "shadow.