The number of eyes a butterfly has depends on its life stage. Once it hatches, the caterpillar, or larva, has 10 to 14 (though usually 12) small eyelets arranged in a semicircle around its face.

Part of the iconic nomenclature is the butterfly's look. Huertas said she was inspired by the butterfly's eye-like patterns, which she thought resembled Sauron's fiery red and black eye.