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The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors...

In the context of hairstyles, the usage of the term pigtail (twintail or twin tail) shows considerable variation. According to most dictionaries, a pigtail is a braid of tightly woven hair. The name is based on the short, thin and kinked tail of a pig, referring to the way a short, tight braid may stand out from the scalp through asymmetric tension of the weave...

Insanity, craziness or madness is a spectrum of behaviors characterized by certain abnormal mental or behavioral patterns. Insanity may manifest as violations of societal norms, including becoming a danger to themselves and others, though not all such acts are considered insanity. In modern usage insanity is most commonly encountered as an informal unscientific term denoting mental instability, or in the narrow legal context of the insanity defense...