An imaginary is a number that doesn't exist, such as the square root of -1. When you do -1^2, you get 1. When you do 1^2 you get one still. However, the square root of -1 is impossible, because there's nothing you can square(^2) to get a negative number. This is why we call it an imaginary or unreal number, because it doesn't exist. This picture is saying " **** just got real" because at the moment **** is an unreal number. You can't square anything to get a negative " **** ". However, if you are to square(^2) the square root of the negative " **** ", it will remove the square root symbol and **** will just be negative, or - **** . Negative numbers and positive numbers are real. **** just got real because it used to be imaginary, now it's real.