The photos above shows the dis-assembly of the LED diffuser (the rectangular white light)
I will upload a video of the dis-assembly soon.
This is just a simple and nice on/off indicator.
Basically it's just light shining through a mirror imaged word "ON" that is behind the paper,
projecting a shadow that looks like a normal "ON" ward that can be seen through the front page.
Without the light shining through the mirror imaged word "ON", the word "ON" will not appear in front of the paper.
So by doing this, I wrote the word "OFF" lightly on the front page of the paper at the position where the "ON" word will appear,
This will be the effect you get.