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The key difference is that the showerhead perc tends to hand from above, while the UFO perc hovers in the middle of the glass it is attached to. However, there is an even more distinct way to characterize one from the other, and that is through their outline. A showerhead perc is not rounded on its edges. Rather, it has angular edges that make it look like a flattened cylinder. The UFO perc, on the other hand, looks like a frisbee disc. It has rounded edges, like that of a flying saucer.