What is a Non-Quad Displacement? Something that Hammer does not like at all. Can break Maps, and go invisible, making it near-impossible to find it and destroy it. Let's take a look at one that hasn't messed with anything yet. Then, there is the rarely used, and Hammer-killing brush... the Sphere. Now, let's put those two together. Remember the "Carve" tool? The one you always used before learning of the Clip tool? The one that created microbrushes. The one that crashed Hammer numerous times when you used it. Let's press that button. My God. Let's see the 2D view! The most shocking part of this whole series of events? Hammer did not crash. Enjoy this, and remember: Don't try this at home.