Is The Glass Half Full Or Half Empty? Answer: It Doesn't Matter (VIDEO)

It's the age-old question: Is the glass half full, or half empty? According to happiness researcher Shawn Achor, it doesn't matter.

"Our entire brain is focused on the glass, whether it's half full or half empty," he says on his upcoming "Super Soul Sunday," appearance. "And we can argue forever and ever between optimists and pessimists, and both can say that they're being unrealistic."

Instead of focusing on the glass, the Before Happiness author says to imagine there is a pitcher of water sitting next it.

It's an entirely different way to look at things, Achor points out. "We can actually fill up that glass," he says. "I actually could care less about whether it's half full or half empty right now if I could fill it up."

"That changed me," Oprah says. "Oh, that's a good one. I could care less if it's half empty or half full -- if you have the pitcher to fill it up."

"Super Soul Sunday" airs Sundays at 11 a.m. ET on OWN.