Both light and sound can be faded in or out. This provides a softer change than going from something not being there to being totally there all at once. A sharp change rekindles the attention. A progressive change gives us time to adapt to it and can even become an event in itself. There are things in life that we simply have to wait for. Waiting for a long time might make it seem like there’s no movement at all. Perhaps the “technician” is doing a very subtle fade-out of the old and fade-in of the new conditions. Perhaps this moment of change is an event in itself.