3

“I heard in one of these lectures about an experiment where they give guys a pair of glasses that make them see the whole world upside down, but after three days, guess what? They see everything right side up. And then they’d take off their glasses and they see everything upside down again. For three days. And then Eureka, back to normal.”

“Yes, it takes the brain three days to adapt.”

…

“Three days…three days for the world to turn right side up again.”