Why Does Clara See Things in Boxes?

So when the mother is emotional or the sun is transmitting in the panes of glass or she's getting lost in the field, she sees multiple images because she is processing the images and the emotions.

What does box mean in Klara and the Sun?

view spoiler) As a physical symptom of internal pressur… more It becomes more apparent as the novel progresses, Klara sees boxes the more stress or tension she perceives. As a physical symptom of internal pressure her vision becomes more pixelated, kind of a robot's migraine. ( less) (hide spoiler)]

Why is Josie sick?

Josie is frequently ill, which in her case makes her bedridden. While the specifics of her condition are never known, it's heavily implied that her illness is a side-effect of artificial gene editing, a process known in the novel as “lifting”.