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I created this Microscope's Field of View using 3 particle systems. The Base Layer is a water animation created using a fractal noise; the first level of particles is created using CC Particle World and it's meant to look like quickly-moving bubbles. The Second Level of particles is created using Particular with a custom designed sprite, and is meant to look like a microscopic organism. The Third Set of particles are also created using Particular, and are added to mimic more floating debris. Finally, an arrow indicator is added to accurately simulate a microscope's FOV.