Not a fan of this puzzle at all, for several reasons:
-The pattern you are trying to get to is not even slightly clear from the mural.
-Also it's not even clear the mural is relevant to the puzzle. Realistically there's a natural break point between the main activity in the area with the mural and when you need it. The player might have encountered it days ago real time.
-The orientation of the puzzle is only explained by the beam of light and a journal. The rest of the time books are flavour or if they have something you need to know they present it unobtrusively enough that a skim read would pick it out.
-Even when you know the pattern, and the orientation, the puzzle is kind of fiddly
-... or you can just make a spot check and flip a lever
And IMO it's not so much that the lever is the problem but the acknowledgement that this puzzle is putting the player through a lot of work doing something they aren't normally doing in the game in order to just progress through an empty room. The lever need to be there because being generous the puzzle is far too obscure, but stating it bluntly, it's a badly designed mess. I get the ambition but it's just not going to play out that way the vast majority of the time.
