As the two walked along the desolate shore, the ruins of Tokyo-3 in the distance, Shinji was lost deep in thought. He was considering something that had struck him just this morning.
"How do we know that this isn't part of instrumentality?"
"I mean, how can we know what's a delusion and what isn't? This entire world could be a creation of my mind, or yours."
There was a silence.
"I never thought about that…"
They both mulled over the question for a few hours, before they mutually agreed never to raise the topic again.