<span>According to
Atticus the reason why Mayella throw false accusation to Tom because Mayella
felt quilty and ashamed because she broke a severe long usage of code and she
was white and induce a Negro to do wrong. Hence Mayella did something that the
society is incapable of being expressed in words because she kissed a black man
and there were no code considered to her before she broke it but it came
crashing down on here afterwards. That is why in order to rid herself from
guilt she tried to ruin the evidence of her offense and this evidence consisted
of Tom Robinson himself, Mayella’s daily reminder of what she did. </span>
The lighting is encased within a very unusual encasing. By the looks of it, it is custom made and crafted to have it's unusual shape. The unusual shape may be made by stained glass, or colored glass. Stained glass is usually created using fiber and silica. Because of the thickness, most of it absorbs the light (as we can see that not the whole shape is lightened up, as well as how the light does not show up inside the house), as well as reflect them (as parts of the color is not dark enough to absorb). While this shape is unusual, and is not very useful, it still does the job it is suppose to do, dim the light.
hope this helps