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Army ButterfliesIf you’re a tetrachromat—which, odds are, you aren’t—you can see more colors than the rest of us, thanks to an extra structure in your eyes. The structure, known as a cone, detects certain light wavelengths. With three cones, most of us can see about a million colors, while tetrachromats, who have four, can see 100 million, Popular Science reports. One such person is an artist named Concetta Antico, who explains her experience gazing at a leaf: “Around the edge I’ll see orange or red or purple in the shadow; you might see dark green but I’ll see violet, turquoise, blue … It’s like a mosaic of color.” At Newser