return {
    "assets/backgrounds/city-background-1.png",
    "assets/backgrounds/city-background-2.png",
    "assets/backgrounds/city-background-3.png",
    "assets/backgrounds/city-background-4.png",
    "assets/backgrounds/city-background-5.png",
    "assets/backgrounds/city-background-6.png",
    "assets/backgrounds/city-background-7.png",
    "assets/backgrounds/city-background-8.png",
}