 So, what the hell is a Hume? A Hume is a way to determine the strength and or amount of reality in a given area. Now, you may have issues with reality being measured this way. And it's certainly a hard concept to grasp. One of the better analogies that can be used to explain this works like this. Picture that everything in the universe is covered with a thin layer of sand. This is the baseline level of reality, one Hume. When some of the sand is removed by any means, there is less sand around and the level of reality has dropped. When sand is added, there is more reality around. Now, this explanation is highly simplistic, but it helps introduce the concept and gives a nice visual representation. So, using this analogy, Humes just measure the amount of sand in an area. Clear?