What hides between Shadow and Light?

[Villane]

Don't know if the puzzle has been solved yet (I'm visiting these forums for the first time), but I thought of how Fibonacci might relate to the numbers. If you take the beginning of the Fibonacci sequence 0,1,1,2,3,5,8 then you can group the numbers into rows by length:

3,
9,
7, 4,
8, 9, 5,
7, 11, 6, 6, 13,
7, 8, 6, 9, 6, 11, 8, 13,

Don't know what could be done with that, though.