Read these lines: "There is one marked peculiarity about this paper, a thing nobody seems to notice but myself, and that is that it changes as the light changes. At night in any kind of light, in twilight, candlelight, lamplight, and worst of all by moonlight, it becomes bars!" According to the quoted lines, what does the outer pattern turn into at night?

1. 1. The quoted lines say the paper changes as the light changes. 2. 2. They then list the night lights: twilight, candlelight, lamplight and moonlight. 3. 3. In any of them, the lines say, it becomes bars, so the answer covers every kind of light after dark. 4. 4. Moonlight is called the worst, not the only case, so an option limited to a full moon misreads the list. _Source: The Yellow Wall Paper by Charlotte Perkins Gilman (1892)_