The perfect mathematical pun doesn't exi— Oh wait, it does. Someone cleverly arranged this person with their arms out to form |x|, the notation for absolute value. In mathematics, absolute value represents the distance of a number from zero, regardless of direction. So |-5| = 5, just like |5| = 5. Much like how this person seems equally passionate about both positive and negative values. Mathematicians don't tell jokes often, but when they do, they're absolutely valuable.