When something is missing from a whole, it has a hole in it. Some of these are easier to see than others. We can't see a hole in our heart, or a hole in our soul, but we can see them in many objects around us.
Your task is very simple. Take a shot of anything that has holes in it. It might be cheese, a piece of cloth or a keyhole. Anything, as long as one or more holes are present. Good luck!