I completely forgot the dimensional theory(Is it much of a theory now?). Time is the fourth dimension, just image everything that ever happened in the past and future crammed into one image.
Edit: Unlike paint, light when combined into one spot it forms the color white. Over the billions of years and enough light has been collected in the image from the past and future, you should have a blank white image.
However I can give you a metaphorical image of engines, or a river.