not understanding, n.All

Not-understanding (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠also IT; there would be no bright stars without dim ones, and no stars at all without the dark.