The image is all about human life. The sky cover the sun which provide shades on the earth. Just like human life we have some shade provided by our parents our loved ones who are just like shadow. Other aspect of the picture is good days are jusry like shadow and bad days are like direct heat. Besde this if we see the lower part of the image we have all facilities available to explore more things for our benefits and humanity benefits from this earth which is filled with expensive resources.