art, atmosphere, background, blue, blue background, boys, brightness, calvin, calvin and hobbes, clouds, crater, earth, fantasy, fiction, flowers, galaxy, glow, gradient, grey, hobbes, horizon, island, lake, land, light, line, mountains, nebula, of the field, of the strip, on the edge, reflections, satellites, sea, space, star, stars, the moon, the sky, tiger, trees, water, water spaces, world, zipper