Kind of odd

[Eddie702]

I found a light wired this way. Whoever wired this could have used 3 wire cable between the basement and the attic. I guess there is nothing wrong with doing this but it's bugging me for some reason

 

[Little Bill]

I found a light wired this way. Whoever wired this could have used 3 wire cable between the basement and the attic. I guess there is nothing wrong with doing this but it's bugging me for some reason

Did you draw the diagram with an Etch-A-Sketch?
Hard to tell what's going on in the junction boxes. It would have been good to add some colored in circles to represent wire nuts & splices. Some wires look like they just run through the JB and not spliced.