The Big Bang Theory2007

Leonard Hofstadter:
You know, there's a foundational idea in string theory that the whole universe may be a hologram.

Penny:
What do you mean?

Leonard Hofstadter:
Well, the holographic principle suggests that what we all experience every day in three dimensions may really just be information on a surface located at the farthest reaches of our cosmos. So it's possible that our lives are really just acting out a painting on the largest canvas in the universe.

Penny:
Huh.

Leonard Hofstadter:
What?

Penny:
Sometimes I forget how smart you are. [kisses Leonard]

Leonard Hofstadter:
You should visit more often.