Something is wrong with the light. That's all you need to know.

Flicker

Told entirely from the passenger's point of view, Flicker is a single unbroken ascent inside an elevator car climbing from the ground floor to the third. Nothing more happens than a flickering overhead light and the steady tick of the floor indicator — and that's precisely what makes it impossible to look away from. Something is wrong with the light. That's all you need to know.