Describe how the screen is lit and build visual thoughts
If you randomly press buttons and see what happens, maybe you're on the right way.
Pixels are white if grey>1, black if grey<0
And some varying grey between 0 and 1.
Colors are multidimensional or unidimensional or both.
Caution - light sensitive persons
Be aware that the screen could eventually blink fast.
Depth of randomness :
Press F to show/hide interface ;)
Press "new" to start
Performance setting :