translation.en: Or, if you want to paint, you can paint it blue throughout because every roof which you see in this picture collects rainwater drops and deposit in the rooms.
translation.zh: 或许，如果你想作画，你可以把这里画成蓝色， 因为在这张图片里你看到的每一个屋顶 都是用来收集雨水的， 并把这些雨水引入屋里储存起来。