Minecraft wiki entry for Cave, associated text: Noise caves are generated using a noise generator. They come in the form of cheese caves, spaghetti caves, and aquifers.[3] By adjusting noise frequency, hollowness (for cheese caves), and thickness (for spaghetti caves, noodle caves, and noise pillars), noise caves can vary in extremely diverse ways. When generating noise caves, the game firstly generates a random noise field, and "smudges" it using a mathematical trick called Perlin noise. These processes then results in a 3D noise image. Noise pillars also generate inside cave blobs.