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A brush is a predefined shape used in the K2 Editor to apply properties to terrain, textures, blockers, and more. In the K2 Editor the user has a selection of 31 pre-defined brushes to choose from. These brushes vary from circles with a gradient radius to brushes made specifically for forming mountains. Once a brush is selected the user selects the brush strength, which dictates how much of the brush is applied per click to the terrain, texture or foliage being edited.